Strange you mentioned Kaliningrad because Russia is not offering a referendum there. Everyone I meet from Kaliningrad are quick to point out that there are really from Königsberg as it is really a German town. What If Merkel sends in special forces with bandanas over their faces?
My understanding is that the Russians sent out some feelers to the Germans about taking Kaliningrad off their hands. The Germans said “no thanks.” The Soviets used Kaliningrad as their toxic waste dump. Nobody wants it now.