Mark,
“Nobody is talking about sending troops to Ukraine.”
This stops when one of Putin's own inner circle realizes that Russia is in an unwinnable, longer term war, this isn't the walk in the park Putin said it was, the damage to Russia, its economy and status as a world superpower if they didn't have nukes is completely blown, and the only way this now ends for Russia to for someone to put a cap in the back of Putin's skull.
Whether Putin's death is ordered and funded by one of Russia's Oligarchs or in Putin's closest inner circle is the only question IMO.