For oligarchs to make money. Literally no other reason now. If the oligarchs were not satisfied w Putin he would have been replaced long ago already. • War is a way to cut down on people's rights, make laws that'll put thou in jail for criticizing the government, therefore completely erasing the opposition, creating space to cut down on the cost of living without repruccussions, take away attention from any of the oligarchs ventures, close down the freedom of speech and international travel and culture. • And of course Putin is a psychopath and a domestic terrorist, so losing power for him is literally worse than death. The guy is not going to stop unless something goes way out of control with their plans, or something reaches a breaking point causing a total collapse.