You brought it up, don't go into the kitchen if you can't handle the heat.
So just give into nuclear blackmail any time he (Or anyone) wants to kill people and screams "I'll nuke anyone that tries to stop my wonderful killing!)
No thanks
Well, Putin shouldn't have shot his way in, deported people (ethnic cleansing), ruined cities and murdered and tortured his way to fake election victory.
You are going to excuse that and say, well, what is to be done?