Isn't Putin's Regime Survival a Top Priority?

I think most people would agree Putin cannot afford now to lose this war because if he does, it's not that Russia will disappear necessarily. At the end of the day, he'll kill or lose as many people as necessary to make sure he stays in power. And I think surviving inside Russia will be his priority. The U.S. military assistance amounts to something over $25 billion over all assistance to Ukraine if you include future commitments.