Here's my prediction: Russia will take control of all or most nuclear power plants and other infrastructure. At which point it's only a matter of time until the people of Ukraine will surrender with no water or electricity. As it stands the West can do nothing. In the case that NATO starts shooting, the sarcophagus over Chernobyl can be bombed (Putin can blame Ukrainians here). It seems to be that there's no way out…
I don't really buy the Chernobyl argument either. If the NATO starts shooting the Russians already have nuclear weapons to act directly. No need to crack open an old nuclear plant and hope the wind doesn't change.