Sure, the US isn't even in the agreement currently, it hasn't been ratified by the Senate. Independent of which, international treatises are treated by US law

Sure, the US isn't even in the agreement currently, it hasn't been ratified by the Senate. Independent of which, international treatises are treated by US law as part of regular domestic legislation, meaning any treaty the US enters can be exited by any act of congress that supersedes it, just like any regular domestic US law. This, as an aside, is why it's been constitutional for the US to break all the treatises written with native American tribes.