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NATO was established as a defense alliance to counter the threat of the Soviet Union. After the collapse of the Soviet Union, NATO continued its activities and participated in various wars. As membership increased in Eastern Europe, Russia became concerned about NATO expansion, which led to the Ukraine war. NATO's internal problems include dependence on the US, the military weakness of smaller members, and economic and political challenges with Türkiye. These issues, along with changes in public opinion, have raised questions about NATO's ability to deal with future threats.