He doesn’t seem concerned about it, since he launched this war 830 miles of border with NATO has been added and Putin casually pulled troops away from that border when he wanted to, Kaliningrad has been largely neutered along with the Suwałki Gap, as NATO grew.
You’ve got everything that doesn’t matter figured out. Putin is pressing forward, completing his plan. When he’s ready to stop, he’ll stop, unless his current offer or something close enough to his offer is accepted.
Or, someone stops him. If NATO/US could stop him they would have.