EU treaties explicitly say that a member can leave them (in particular article 50 of the Treaty of the EU). In general a country can't get out of an internatio

EU treaties explicitly say that a member can leave them (in particular article 50 of the Treaty of the EU). In general a country can't get out of an international treaty unless the treaty itself has provisions for it. Of course the only way to enforce an international treaty, if threats or sanctions are not enough, is war.