We are not in the land-grabbing business. We are in the Nazi killing business. And the business is going well. There is no reason to bite more than you can chew. And chewing, say, region with twenty million population with, say, 10% of them actively anti-Russian, which makes 2 mln potential terrorists might be a messy thing. We are not going to repeat you Iraqi mistake - killing "dictator" without elimination of his Army and assimilation of his people. And when there is an opportunity to kill them in the open field, without significant collateral damage and without killing innocent civilians - it is better to use it.
Denazification, demilitarization and neutral status. Those are our modest and reasonable goals.