Kellogg–Briand Pact
If a nation does not register with the UN as recognizing the Kellogg–Briand Pact, even if the nation had signed it, the UN cannot hold a claimed violation of the Kellogg–Briand Pact to be a violation of international law (according to its own Charter, Article 102). The interpretation of Article 102 is reserved to the Security Council, so it is possible that a "crime against peace" might be found by the Security Council, regardless.