What are 3 critical decisions NATO has made?

Three critical decisions NATO has made include the expansion of its membership to incorporate former Eastern Bloc countries, which aimed to enhance security in Europe post-Cold War; the invocation of Article 5 for the first time after the 9/11 attacks, leading to the deployment of NATO forces in Afghanistan; and the enhanced forward presence in Eastern Europe in response to Russia's annexation of Crimea in 2014, reinforcing deterrence and defense strategies against potential aggression. These decisions reflect NATO's adaptability to evolving geopolitical challenges and its commitment to collective defense.