I rather think Russia wants Lemberg/Lwow and the rest of Galicia back in Poland, because that would remove most of the anti-Russians and open the road to Kiev.
I’m sure Putin would gladly part with Kaliningrad to bring Merkel on board. Throw in Grodno, Brest, and maybe Wilno, and maybe Breslau and Danzig come into the picture.
Interesting. I'm quite sure Hungary wouldn't mind taking back a slice either.