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Note: NATO is a defensive military alliance, it was created so member countries can react together against outside aggression towards any member. They don't have to go to war when one of the member states initiate it. They had to participate in the "War of Terror", had to go to war in the Middle East and Central Asia because a members state, the USA was attacked with 9/11. Sure NATO would go to war if North Korea would launch a ICBM into the US (or any other member state), but North Korea isn't any threat in general, unlikely she will invade Lithuania for example...