Is Putin Going to Stop Threatening Nuclear War?

Putin is creating fake referenda to pretend that people in Ukraine have voted to hand their land back to power under the Russians, which we all know is completely bogus. 93% of Ukrainians polled who don't want to give an inch to Putin or do any kind of deal. Once he knows he can threaten nuclear war and get what he wants, he'll keep threatening nuclear war and he'll keep taking all the land back,. He thinks Russia was wrong to lose when it was a Soviet Union. And I just think in the end, if we let Putin win, does anyone think he's going to stop there?