Of course not. All it takes is for Putin to disappear (metaphorically or physically) coining a change in government. Remember, Russia used to be quite a prosperous country when they were tackling their internal problems rather than trying to invade their neighbors constantly.

I think we are not too far from that point. Hundreds of thousands of young soldiers killed, economy in ruins, shunned by a large part of the first world. The only way to counter that is a tightening grip on his subordinates and the population. That works only temporarily.

And of course there's the NATO bid. As soon as there is a truce, Ukraine can join. Exactly the reason that Russia demands that Ukraine doesn't join. I would say the exact opposite is happening. Russia is losing and is now trying to at least block Ukraine from joining NATO.