NATO is celebrating its 60th anniversary. It was founded in 1949 to defend Western Europe against the Soviet Union during the Cold War. Some key challenges facing NATO include managing its strategic relationship with Russia, dealing with new threats like cyber attacks and asymmetric warfare, fighting religious extremism, potentially getting involved in resolving the Israeli-Palestinian conflict, intervening in African conflicts, reforming internally, maintaining its open door policy towards new members, and helping reform the defense structures of Ukraine and Georgia. NATO has been successful in defending Western Europe and undertaking missions in places like Kosovo and Afghanistan, but it faces significant challenges adapting to today's complex security environment.