>>520806088
That's retarded on two seperate levels.
First of all, if you rush the capital, grab it and declare victory you've only transformed the conflict from an open one into an insurgency. You can ask the Americans, they are world class experts at losing their wars this way.
Second, assuming the Russians are doing this the correct way, which they currently are, taking the capital still isn't the actual end because the opposition still has bodies to throw into the battle so they declare the next city their capital.
You have to spread a wide front line and kill everyone willing to show up to the fight. And keep doing that until you've combed through every tree, stone and basement, all the way to the border. Attempting to cheap out and skip this step is a recipe for failure.