Gary Kasparov:

"Putin's russia has been the greatest destabilizing force in the world, from interfering in elections to supporting dictators from #Iran to #Venezuela, to destroying entire cities in #Syria and #Ukraine. Victory for Ukraine will spell his end and a chance for a new russia. Planning for every contingency, yes. Using worst-case scenarios as an excuse for inaction in the face of evil, never. #Ukraine must win, and the sooner the better for the world."

https://www.foreignaffairs.com/ukraine/dont-fear-putins-demise