In order to be a member in the European Union or EU, countries are required to be a democracy. They all have democratic governments but have different styles of democracy.
The North Atlantic Treaty Organization was created in 1949 by the United States, Canada, and several Western European nations to provide collective security against the Soviet Union. NATO was the first peacetime military alliance the United States entered into outside of the Western Hemisphere.
The United States responded by pushing a resolution through the U.N.’s Security Council calling for military assistance to South Korea.