But then, they have also managed to seize a huge tract of territory in South and East Ukraine (in addition to what they seized in 2014).
They got most of it in the first couple of weeks. They gave up a lot of territory in the north after taking it initially. It's been a stalemate at best for the last two months. Considering Russian losses and Ukrainian weapons supply, this is not looking good for Putin.
they need a safe exit, may be U.N can jump in to end this war.
UN won't do shit. Russians can exit any time. The sooner the better for everyone.