Withdrawal from international organizations

thumb|right|The United Kingdom in orange; the European Union (27 member states) in blue: a representation of the result of Brexit Brexit (; a portmanteau of "Britain" and "Exit") was the withdrawal of the United Kingdom (UK) from the European Union (EU).

legal process of Article 50 TEU

the legal procedure of enacting Article XIII of the North Atlantic treaty

not provided for in the United Nations Charter