What an epic blunder by Putin which we can only hope leads to some kind of change in Russia.
I agree with the blunder part but only if he ends up failing to control ukraine. So long as he succeeds there, the russian people will lose big time but Putin will do just fine. But if he loses, I don't think he will leave peacefully but he will leave.
There's no rational benefit, it's just the bizarre thinking that a physical buffer between Moscow and NATO is somehow helpful in a world with thousands of ICBMs.