Aannddd....The best way to deal with him is attrition.
Not the most satisfying way, not the most "just" way, but it keeps things calm enough that putin can't justify using what still works out of his arsenal of antique nukes.
The Ukrainians seem to accept this is the best way to go. They don't want him using nukes or chemical weapons either. They're getting advanced weapons systems, and the training to use them. Their soldiers are getting top notch training, from NATO nation trainers. They have high moral, after facing a tough fight over the winter.
Their opponents are running out of gear, have little desire to fight, many are going into battle expecting to die. The Ukrainians are breaking russian supply lines, reclaiming territory at an incredible rate...
this is far from over, but things are going very well. putin can't continue to press this war for much longer, his first round of real conscriptions has been met with defiance, arson, masses fleeing the country. the next round will be drafting grandfathers, boyscouts...how long till they take grandma and the girl guides? will he draft dogs next?
but my point is that while this seems to take forever, and cost a lot of lives, the alternative would be worse, and could lead to something horrific...