Think about your argument.
You think that Russia and Putin want to cease to exist?
Added up to their morality of a chain saw, we've got a drunk monkey with a razor in its hand running through corridors of a kindergarten.
It has been conservatively estimated that Russia from 1683 to 1914 extended its sovereign territory on average by 55 sq. Miles every day!
I would add that Trotsky and then Stalin recovered much that was lost after 1917.
Will Putin recover what was lost after Gorbachev?
Is there any evidence that Putin will behave contrary to half a millenium of Russian history?
Maybe they just know that no matter what they do it will take the US two years to begin a response.