Key issues facing NATO, and some new challenges its chief wants to tackle:
AFGHANISTAN: U.S. is pressuring member states to contribute more troops to battlefield. Some of those states say they want clear battle plan or they'll quit the fight.
RUSSIA: Russia is alarmed that NATO countries now sit on its borders, and vehemently opposes adding Georgia and Ukraine to alliance. It also opposes U.S. plans for missile defense system in Czech Republic and Poland.
BALKANS: 16,000 peacekeepers patrol newly independent Kosovo, and NATO intelligence is helping hunt for former Bosnian Serb leader Radovan Karadzic and other top indicted war crimes suspects.
IRAQ: Since 2005, NATO has helped train Iraqi security forces, including paramilitary police units and military.
CLIMATE CHANGE: NATO Secretary General Jaap de Hoop Scheffer contends alliance should gear up to secure food and water supplies threatened by global warming.
CYBERTERRORISM: De Hoop Scheffer wants alliance to clarify how NATO can help protect Internet from computer hackers and other "electronic warfare."
ENERGY SECURITY: Global competition for energy and natural resources is redefining relationship between security and economics, and NATO chief wants alliance to help protect key energy infrastructure.