I think the Soviet Union/Russia (in the modern era) let this genie out and it's not going back in. If they use it, we may be able to impose economic sanctions

I think the Soviet Union/Russia (in the modern era) let this genie out and it's not going back in. If they use it, we may be able to impose economic sanctions for some time. If they get so sanctioned it makes little difference, like with Russia, then nothing will stop them at that point.