| The study revolves around analyzing the Dimensions of the Russian Military Intervention in Ukraine, which is considered one of the most serious international Crises in international relations since the end of the Cold War, because it includes The threat of a large-scale conflict in Europe, between Russia on the one hand, and The United States of America, the European Union and NATO on the Other hand. The study specifically examines the dimensions, determinants, characteristics and Features of US policy towards the Russian military intervention in Ukraine, and its Repercussions on NATO, and In its axes, the study focused on the dimensions and Developments of the Ukrainian crisis, the strategic importance of Ukraine in the Russian and American perspectives, the determinants of US policy towards the Russian-Ukrainian war, the repercussions of the Ukrainian crisis on NATO, and the Expected scenarios for the end of the Russian-Ukrainian war, Using the analytical and deductive approach, and the decision-making Approach, the study reached several important conclusions, including: that Russia Cannot retreat in Ukraine or leave it to become part of the European Union or NATO, Moscow will not stop its military operations in Ukraine until it obtains clear pledges That NATO will not carry out new expansions on its borders, and that Russia has not Fully achieved its military objectives as planned, And that the Russian-Ukrainian war Restored the cohesion of the North Atlantic Treaty in an unprecedented way, and Made it more cohesive than before, |