null and void treaty

基本解释

And because the Soviet Union was no more, Frank thought in his wisdom, and of course he was right, because he's right about everything, that since the other signatory to the treaty no longer existed that he should get the American signatory to call it null and void and call for vacating the treaty.
CENTERFORSECURITYPOLICY: Monica Crowley, Mightier Pen 2012
Another analysis by retired intelligence officer William Lee makes clear moreover, that -- even if the Treaty were still in effect -- the fact that first the USSR and subsequently Russia deployed and maintained a prohibited territorial defense against ballistic missile attack would offer grounds to declare the Treaty null and void.
CENTERFORSECURITYPOLICY: Center For Security Policy