Putin declares four areas of Ukraine as part of Russia

[Taunton Blue Genie]

Russia is currently occupying about 20% of Ukraine, with more than 3 million Ukrainians living there under occupation.
If it was in the uk that would be equivalent to giving up an area double the size of wales with 10% of the UK population living it -it would never be considered.

Your last line doesn't really mean anything in the context of Eastern Europe, the history of the Soviet Union, the fact that red lines on maps don't delineate peoples in that region perfectly, mixed cultural heritage, the history of Ukraine, the military might of Russia and repeated incursions into Ukrainian territory etc etc etc.