Ceasefire so civilians can get out. Then, let the Ukrainians and Russians duke it out. Russia is the invader, the aggressor here. And in a stalemate the defender is the victor.
Once civilians are evacuated then Russia is free to turn the cities to rubble and killing most of those still trapped within. Things will start moving more quickly now, Ukraine will be destroyed, and only an unground insurgency left (financed by the West) that will linger on as long as possible to further weaken and isolate Russia. That was the plan all along. Too bad for Ukraine though, there won’t be anything left for them to return to.