Just give the UKR and other bordering nations tactical nukes then we don’t have to worry about what Russia does -we’ll know.
They’re leave UKR and remain inside Russia’s borders lest what they’ve done to their neighbors is done back to them.
That even gets us further towards WW3. It is the Cuban missile crises all over again with the US and Russia in reverse positions.
Mother Russia will not use tactical nukes. She wants to continue to live, even in abject poverty