I agree somewhat; not because I agree that the Russians took it for the cause of Stalin or that I want to get into the whole Stalin = Hitler or not, but because well, I think the war is long over and it belongs back in Germany, whatever or whoever it was taken for.
Ironically, I don't think we actually need the Amber Room so much anymore since it was superbly restored. Saw it myself a summer ago
Putin would love the gesture of returning it though, and it would be a great gesture of reconciliation if he traded it back for art taken from Germany.