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In the world of diplomacy unilateral action is frowned upon. A country taking such action would be regarded as somewhat of a rogue and would suffer for it. The US, of course, is large enough and powerful enough to shrug this off, and would probably suffer no worse repercussions than the French sniggering behind their hands and thinking, privately, barbarians.
It is of course possible to withdraw from a treaty legally, though not necessarily immediately. It is not impossible, but, as I said originally, I suspect it is way too hard for our sorry lot of politicians.
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