Unless said missiles are set to go off when Putin's heart stops beating like the Russian prick from Snow Crash, his minions will be even more elated than us when he dies. Unless they like their economy being driven to ruin and their country turned into a global pariah.
And if liquidating the wicked witch of the eastern bloc automatically triggers the launch of all their nukes, then that eventuality is a foregone conclusion that we're STILL better off resolving before the entirety of Ukraine is a smouldering crater.
If I came home to someone raping my mom with a gun to my dad's head and threatening to kill them if I tried to interfere, I'd take a page out of Kaiser Soze's playbook and lean into the violence instead of away from it. If people are going to die, they damn sure aren't all going to be on my side of the fence. But I have trouble believing anything told to me by active terrorists isn't a lie.