(CNN) -- Scores of people were killed in violence across Syria on Monday, opposition activists said, while Russia insisted a political solution was the only answer to end the bloodshed.
Here are fresh developments in Syria's bloody civil war:
Opposition: 50 regime soldiers killed at checkpoint
A suicide bomber killed at least 50 Syrian soldiers Monday at a checkpoint in Hama province, the opposition Syrian Observatory for Human Rights reported.
The opposition group said the bomber was from the al-Nusra Front, which has claimed responsibility for past suicide attacks.
The state-run Syrian Arab News Agency said a suicide bomber killed two people and injured 10 others.
CNN cannot independently confirm government or opposition reports out of Syria, as the government has restricted access by journalists.
A mannequin used by rebel fighters as a decoy is seen in an area where clashes continue with pro-government forces in Aleppo on Friday, November 2. Click through these photos from October and November; also see September photos from the conflict. A member of the Free Syrian Army runs for cover from sniper fire in Aleppo on Friday. Members of the Free Syrian Army stand close to an unexploded bomb dropped by a fighter jet weeks earlier, at a checkpoint in Aleppo on Thursday, November 1. Buildings lie destoryed by what activists say were missiles fired by a Syrian Air Force fighter jet loyal to Syrian President Bashar al-Assad, in Erbeen, near Damascus on Thursday. The Suleiman al-Halabi neighborhood of Aleppo, Syria, is now under full army control, according to state media. Heavy damage can be seen on Tuesday, October 30. The Armenian Surp Kevork Church (Saint George Church) in Aleppo shows damage on Tuesday from a fire that broke out during fighting between rebel fighters and Syrian government forces. The streets are littlered with rubble from a building in Aleppo on Tuesday. A Syrian rebel fighter looks at smoke billowing from a bus that caught fire after a regime sniper allegedly shot at it in Aleppo on Sunday, October 28. A Syrian rebel fighter aims through a hole in the wall that overlooks a position held by troops loyal to Syrian President Bashar al-Assad on Sunday. Commander Abu Sleiman looks at the pro-Syrian government forces' position prior to an attack in Aleppo on Saturday, October 27. The latest reports of violence saw each side accuse the other of violating the conditions of a cease-fire called over religious holiday Eid al-Adha. A Syrian rebel interrogates a handcuffed and blindfolded man suspected of being a pro-regime militiaman after he was detained by the Free Syria Army in Aleppo on Friday, October 26. Syrian rebels take position Friday in a classroom at an empty school to observe the movement of regime forces nearby in Aleppo. Syrian rebels run to take position in the Bustan al-Basha district in Aleppo on Friday. Smoke rises from a gas station following a mortar attack as Syrian women walk by on a rainy day in Aleppo on Thursday, October 25. A member of the Free Syrian Army watches for snipers during fighting against pro-government forces in Idlib Governorate on Thursday. A family crosses a street flooded by heavy rains in Aleppo, Syria, on Thursday. Syria drivers attempt to drive through a flooded street in Aleppo, Syria on October 25. The Syrian military and the country's main rebel force have agreed to halt combat operations starting Friday morning for the Muslim holiday weekend, but both also reserved the right to respond to attacks. Members of the Free Syrian Army patrol an area under their control, as they advance on pro-government forces in Harem town, Syria on October 25. People crowd around a bakery in the Salaheddin district of Aleppo, Syria, on October 25, Civilians carry their belongings along a street strewn with garbage and debris following fighting between Syrian government troops and rebel fighters in the Salaheddin district of Aleppo, Syria, on October 25. The Syrian Arab News agency (SANA) reported that a car bomb in the Tadamon neighborhood of Damascus, Syria, killed six people and injured 20 on Wednesday, October 24. Cars destroyed by the car bomb explosion in Damascus on Wednesday. Smoke rises after Syrian government forces shelled the outskirts of Atareb, Syria, on Wednesday. A family drives through Atareb, Syria, which was recently shelled by Syrian government forces, on Wednesday. Relatives of Syrian detainees who were arrested for participating in protests against Syrian President Bashar al-Assad's regime wait in front of a police building for detainees to be released in Damascus on Wednesday. The Syrian government said it released a total of 290 prisoners who had not been involved in homicides. A Syrian woman, displaced by the ongoing violence and living along a street in Aleppo, on Tuesday, October 23. A woman sits on the sidewalk of a debris strewn street in Aleppo, Syria, on October 23. A rebel fighter looks towards the crossroads, destroyed during fighting between government and rebel forces, in the Salaheddin district of Aleppo, Syria on October 23. Rebel fighters have lunch in the old sector of the northern city of Aleppo, on October 23. Violence raged across war-torn Syria, a watchdog organization said, dimming hopes of a cease-fire for this week's Muslim Eid al-Adha as proposed by UN-Arab League envoy Lakhdar Brahimi. A shopkeeper clears the rubble from in front of his store in the old sector of Aleppo. A member of the Free Syrian Army flees sniper shots from pro-government forces in Salqin, Syria, on Monday, October 22. Members of the Free Syrian Army celebrate on a tank that belonged to pro-government forces after they took over the site from them early Monday in Salqin. A member of the Free Syrian Army celebrates on the captured tank. Syrian army soldiers run for cover during clashes with rebel fighters in the Karam al-Jabal neighborhood of Aleppo on Saturday, October 20. Syria youths react following an airstrike by Syrian government forces in Maaret al-Numan on Thursday, October 18. Syrian regime warplanes launched a new wave of strikes on the northwestern town, seized by rebels last week, an AFP correspondent reported. A wounded Syrian boy is carried to the hospital following Thursday's airstrike in Maaret al-Numaan. A Syrian rebel fighter mans an anti-aircraft heavy machine gun as he heads to the frontline in al-Bab near Aleppo on Wednesday. October 17. Rebels downed a helicopter in fierce fighting Wednesday with troops seeking to retake a key Syrian town, a watchdog said. Syrian rebel fighters on Wednesday ride a motorcycle in Maaret al-Numan, an area under the control of rebel fighters in the northwestern Idlib province. A Syrian rebel fighter holds a gun as he guards a post during clashes with government forces in Aleppo on Wednesday. A handout photo from the Shaam News Network shows smoke rising after a Syrian Air Force fighter jet fired missiles at the suburbs of the northern province of Idlib, Syria, on Tuesday, October 16. Click through the gallery to view images of the war-torn country in October. See photographs from September. Members of the Free Syrian Army check for snipers in the old part of Aleppo, Tuesday. Damaged buildings are seen after they were fired upon by a Syrian government forces near the northern province of Idlib, Tuesday. A Syrian man walks past destroyed buildings following shelling by regime forces in Aleppo on Monday, October 15. A Free Syrian Army fighter climbs under barbed wire as he trains at their camp in Syria's northwestern province of Idlib in an area under the control of rebel fighters on Monday. A young fighter climbs along a rope as he trains at a Free Syrian Army camp in Syria's northwestern province of Idlib on Monday. Syrian rebels take cover during clashes with regime forces at the historic Umayyad Mosque in the old city of Aleppo hours before the Syrian army retook control of the complex on Sunday, October 14. A Syrian rebel walks inside a burnt section of the Umayyad Mosque. Opposition activists reported that the 12th-century mosque was set afire during heavy fighting on Saturday, October 13. A Syrian opposition fighter stands near a post in Aleppo on Thursday, October 11. Syrians carry a wounded girl into a hospital in Aleppo on Thursday. A heavily armed Syrian opposition fighter stands near a post in Aleppo on Thursday. A Syrian man walks through rubble in Aleppo on Thursday. A Syrian man and boy ride a horse cart in Aleppo on Thursday. Smoke billows from buildings following shelling by government forces in Aleppo on Thursday. Syrian people carry bread as they walk in the streets of Aleppo on Thursday. Bodies of Syrian civilians lie in the back of a truck outside a hospital following shelling by Syrian government forces during clashes with opposition fighters in Aleppo on Thursday. Syrian civilians walk in front of damaged buildings in Aleppo on Thursday. Syrian opposition fighters walk in the streets of Aleppo on Thursday. Syrian government forces take cover during clashes with rebel fighters at the Karam al-Jabal neighborhood in Aleppo on Thursday. A Syrian opposition fighter flashes the sign for victory as he guards a post with his comrades in Aleppo on Thursday. A Syrian man mourns the death of his father, who was killed during a government attack in Aleppo on Wednesday, October 10. Syrian youths walk past graffiti in the rebel-held city of Minbej on Wednesday. A Syrian rebel fighter holds a cigarette and prayer beads in Aleppo on Tuesday, October 9. A Syrian man carries the body of his 5-year-old son, Mohammed Mustafa, outside a hospital after shelling by Syrian government forces in Aleppo on Tuesday. An injured Syrian woman rides to a hospital after an airstrike by regime forces in Aleppo on Tuesday. A Syrian rebel commander prays in a damaged mosque during clashes with government forces on Tuesday in Aleppo. A rubble-filled street is seen during clashes between rebel fighters and Syrian government forces in the Saif al-Dawla district of Aleppo on Tuesday. Relatives wheel a injured boy outside a hospital on Tuesday in Aleppo. A Syrian rebel fighter takes position inside a house in Aleppo during clashes with government forces on Tuesday. A Syrian man watches an army fighter jet flies over Aleppo on Monday, October 8. A Syrian army fighter jet flies over the northern city of Aleppo on Monday. A wounded Syrian rebel fighter holds his blood-stained hands as he receives treatment at a hospital near the frontline in the city of Aleppo on Monday, October 7. Abdul Razzak from the Aleppo News talks on a walkie talkie in Aleppo on Monday. Syrian rebels take up positions inside a building during clashes with government forces in Aleppo on Saturday, October 6. Syrian members of the Al-Saiqa rebel brigade clean weapons on Saturday before going to the front line in Aleppo. A Syrian rebel runs across a heavily damaged street to dodge sniper fire during clashes on Saturday. Syrian rebels patrol a neighborhood in Aleppo on Friday, October 5. A Syrian demonstrator shouts during an anti-regime protest in Aleppo on Friday. Tensions rippled across Turkey a day after Syrian shells struck a Turkish border town and killed five people. A Syrian rebel takes position during clashes with government forces in Aleppo on Friday. An injured Free Syrian Army fighter rests after receiving treatment at Dar al Shifa hospital in Aleppo on Thursday, October 4. A child covers his wounds from a Syrian army sniper at Dar al Shifa hospital on Thursday. A Free Syrian Army fighter cries after one of his friends was injured in fighting with government forces outside the Dar El Shifa hospital on Thursday. A Dar El Shifa worker cleans the floor outside the hospital in Aleppo on Thursday. Syrian rebel fighters look at a multirocket launcher in Tal Abyadh, a Syrian town close to the Turkish border, on Thursday. Rebels climb the stairs of a destroyed building Thursday in Tal Abyadh. Smoke rises from the explosion area after several Syrian shells crashed inside the town of Akcakale in Turkey, killing at least five people on Wednesday, October 3. It wasn't the first deadly cross-border incident between the two neighbors during the 18-month-long uprising in Syria. A police officer is injured in Wednesday's attack on Akcakale in Turkey's Sanliurfa province. Three car bombs destroyed the area around a military officers' club and a hotel in Aleppo, Syria, on Wednesday. At least 40 people were killed and 90 wounded, most of them soldiers, a monitoring group said. Car bomb explosions on Wednesday left a crater in the ground. A nurse helps treat a 7-year-old girl who's neck was badly wounded by shrapnel at the Dar Al Shifaa hospital in Aleppo on Monday, October 1. Friends lay a rebel fighter on a gurney after he was shot in the chest during heavy battles in the Midan neighborhood on Monday. See photographs from September. 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Photos: Showdown in Syria At least 159 people were reported dead Monday across Syria, according to the opposition Local Coordination Committees of Syria. This figure includes 72 dead in Idlib province, among them 32 "martyred (in a) massacre in Kafr Nabl." Eight women, seven children and two citizen journalists were among the casualties, the LCC said.
Explosion in Damascus, Syria Samer Kreishi was killed in fighting in the Damascus suburb of Arbeen, where government forces and rebels have been fighting sporadically for months, the LCC said.
Syrian rebels launch new offensive Another journalist, Nasser Sheikhani, was killed during shelling in Aleppo, Syria's second-largest city, the group said.
On the run with rebels in Syria The two were described by the LCC as "citizen journalists" who routinely documented violence by government forces with the use of video and photographs, which were then uploaded on YouTube and other social media sites.
More than 33,000 people have been killed since the Syrian conflict erupted in March 2011, the opposition says.
Russian diplomat: 'No need for any type of resolution'
Video may show Syrian troops executed Russia's top diplomat dismissed a call by the U.N.-Arab League special envoy for the Security Council to adopt a resolution calling for a transition of power in Syria.
Young Syrian amputee's story Read more: Russia: We won't back a foreign force in Syria
"If the priority is the change of (the government), then there will be more blood. But if the priority is to save lives, then there is no need for any type of resolution," Russian Foreign Minister Sergey Lavrov said Sunday after a meeting with the special envoy in Cairo.
Lavrov's comments followed news that the special envoy, Lakhdar Brahimi, called on the U.N. Security Council to adopt a resolution calling for a transition of power in Syria that permanent Security Council members agreed upon in June. The resolution, known as the Geneva deal, was put together by his predecessor, Kofi Annan, and called for a transitional government in Syria.
Brahimi's call for the resolution came after the collapse of a holiday cease-fire he had pushed for between government forces and rebels.
Security blog: U.S. says Russian attack helicopters on way to Syria
The Geneva agreement did not lay out how power would be transferred, nor did it spell out any role for Syrian President Bashar al-Assad, who has been under enormous international pressure to step down and end the conflict.
China and Russia, permanent members of the U.N. Security Council, have repeatedly blocked attempts to adopt a resolution.
Many have accused Russia of backing the Syrian government, but Russia says it just wants a political solution for Syria determined by its own people.
China, meanwhile, has offered a four-point plan to end the war, calling for a cease-fire, plans for political settlement and transition, and international humanitarian aid.
Bullets stray into Israel
An Israeli military vehicle was hit by bullets coming from southwestern Syria on Monday night, an Israeli military spokesman said, in what appears to be the latest instance of violence in Syria crossing into neighboring countries.
No one was injured by the gunfire, and Israeli officials do not believe its vehicles were targeted, the spokesman said. But the bullets are believed to be related to Syria's ongoing civil war.
Israel's military filed a complaint about the incident with the United Nations, according to the military spokesman.
The nation did the same three days ago, when three Syrian army tanks entered the Golan Heights demilitarized zone, according to the Israeli military. The tanks were positioned with their guns pointing toward Syria and fired, Israel said.
A U.N. observer force remains in the Golan Heights to maintain a cease-fire between the Israeli and Syrian forces and to oversee implementation of the disengagement agreement. Israel's government controls the Golan, though some internationally regard it as occupied territory.
The Syrian civil war has spilled over into other countries as well, including Lebanon and Turkey. Stray shelling from Syria into southern Turkey has caused several deaths in recent weeks, ratcheting up tensions between the one-time allies and spurring Istanbul to order the firing of artillery rounds back into their neighbor's territory.
Syria's opposition groups began a second day of negotiations Monday in Qatar's capital city of Doha as part of an effort to unify the rebellion.
The move comes after reports that U.S. Secretary of State Hillary Clinton told reporters that the exiled Syrian National Council should no longer be considered the "visible leader" of efforts to form a government to replace al-Assad, whose iron-fisted attempt to crush anti-government protests has resulted in the bloody civil war.
Security blog: U.S., Russia grapple for common ground on Syria transition
Clinton said the opposition must include seats for "those who are on the front lines fighting and dying today."
The United States has recommended people and organizations that should be included, she said -- and the State Department says Robert Ford, the U.S. ambassador to Syria, will be "on the sidelines" of the upcoming Doha talks.
The U.S. secretary of state's remarks drew criticism from some opposition activists Monday. In a statement, the opposition Local Coordination Committees of Syria said they represented unwelcome "interventions in the affairs of the revolution."
State Department spokeswoman Victoria Nuland said Monday that the United States does not intend to pick Syria's next leaders.
"Only Syrians can do this," she told reporters, "so, none of the activities that we've been involved in since the last months and months are designed to do that. They're simply designed to insure that those Syrian voices inside Syria...are heard and are part of the process."
French President Francois Hollande made a similar statement Sunday, saying that the Syrian opposition needs a leader to set up "an interim government through a fair democratic process," the state-run Saudi Press Agency reported.
Read more: Putting the monkey on Lavrov's back
The negotiations in Doha began after the SNC announced it would elect a new president, replace half of its executive board and expand its membership. The SNC says its meetings are a prelude to talks with other opposition groups later this week.
"Any discussion about bypassing the SNC or forming other alternative entities is an attempt to damage the revolution and sow the seeds of division and discord," the group said in a statement.
CNN's Sara Sidner, Jill Dougherty, Tracy Doueiry and Saad Abedine contributed to this