The North Atlantic Council (also known as NATO) is an intergovernmental alliance concerned with military affairs. NATO implements the North Atlantic Treaty, signed in 1949. Currently, NATO is composed of 29 members. NATO’s main purpose is to safeguard the freedom and security of all its members by political and military means .
The European Council is the meeting of Heads of State or Government of the European Union. The role of the European Council is to provide the political direction of the Union in general matters and therefore it does not implement legislation but just directives, which are usually approved by consensus, meaning that each member state has the power to veto a decision.
The United Nations Security Council is one of the six main organs of the United Nations and is the only organ able to take binding decisions. The organ is composed by 5 permanent members (so called P5), China, France, Russia, the United Kingdom, and the United States, and 10 non-permanent members which are elected for a 2-years term by the General Assembly. Each member has a single vote, but each member of the P5 has the possibility to veto decisions.