indicates a few things.

Mainly that he'll say any old shit that serves him in the moment, but also that he doesn't understand (among many, many other things) the nature of and motivation behind Putin's war on Ukraine, nor why Putin's so keen to grab the rest of the Donbas.

Leaving aside the issue that it's not just about real estate trading, it's about people, it's also about the vast chain of fortifications Ukraine's built in Donetsk and Luhansk Oblasts in the Donbas: the Fortress Belt, or Zaluzhny Line - many scores of miles of intricate layered defences consisting of razor wire, dragon's teeth, deep trenches as tank traps, minefields, supporting heavily armoured dugout bunkers and integrated electronic warfare systems, along with even more heavily protected underground bunkers in some of the urban areas.

Gifting that to Putin would give him an excellent springboard for his next all-out assault. It's just not going to happen.