Why did Putin attack Ukraine instead of retiring on a superyacht? Why is he risking it all for what would, in a best-case scenario, become a decade long guerill

Why did Putin attack Ukraine instead of retiring on a superyacht? Why is he risking it all for what would, in a best-case scenario, become a decade long guerilla war against the ukraine resistance, even if russia managed to capture all of ukraine (which probably was the assumed/likely outcome as the war broke out). Clearly the incentives and motivations of people running oppressive regimes are slightly different.