Not to mention full control of a Black Sea (and therefore entrance to Mediterranean) coastline with multiple ports. As well as a major agricultural products. As well as a huge transit country for Russian energy pipelines.
What does slightly more access to the Mediterranean get you when no European country will buy your goods? All of those things you mentioned are worthless without buyers.
Except the farm land. But it’s not 1444 — trade is vastly more profitable than agriculture nowadays.
IMHO, Putin is looking at this from a century perspective. I.e. in a hundred years, the sanctions will be gone, Europe will be trading with Russia again, and Russia will still have the land.
Moscow from Latvian border: ~620 km
Not to mention full control of a Black Sea (and therefore entrance to Mediterranean) coastline with multiple ports. As well as a major agricultural products. As well as a huge transit country for Russian energy pipelines.