Withdrawal from the United Nations
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Withdrawal from the United Nations by member states is not provided for in the United Nations Charter.
Nevertheless, under customary international law, there exists the principle of rebus sic stantibus, or "things standing thus." Under this principle, a state may withdraw from a treaty which has no withdrawal provisions only if there has been some substantial unforeseen change in circumstances, such as when the object of the treaty becomes moot or when a material breach is committed by a treaty party.[1][2] Rebus sic stantibus has been narrowly construed (although not referred to by name) in Articles 61 and 62 of the Vienna Convention on the Law of Treaties. Therefore, under either customary international law or the Vienna Convention, it is unlikely that the UN would recognize the right of a state to unilaterally withdraw from the UN unless some fundamental change has occurred. The convention also acknowledges that sovereign states can repudiate a treaty and determines in which cases it's customarily acceptable. Also, Article 2 of the United Nations Charter specifically recognises "the principle of the sovereign equality" of all member states of the United Nations.