The pact, in addition to binding the particular nations that signed it, has also served as one of the legal bases establishing the international norms that the threat or use of military force in contravention of international law, as well as the territorial acquisitions resulting from it, are unlawful. The interdiction of aggressive war was confirmed and broadened by the United Nations Charter, which provides in article 2, paragraph 4, that "All Members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations." One legal consequence is that it is unlawful to annex territory by force, although other forms of annexation have not been prevented. More broadly, there is now a strong presumption against the legality of using, or threatening, military force against another country. Nations that have resorted to the use of force since the Charter came into effect have typically invoked self-defense or the right of collective defense.