After Russia's annexation of two self-proclaimed republics in the Ukrainian Donbas in 2022 and the earlier annexation of Crimea, Czech and Polish “X” (former Twitter) users put forward the idea of annexing Kaliningrad to the Czech Republic.

An excerpt from the article 24 facts about Kaliningrad

The mocking "official" account of Kralovec (Królewiec) announced that 97.9% of Kaliningrad's inhabitants voted in the referendum for the oblast to be taken over by the Czech Republic and to change the city's name to the Czech Kralovec.

The Czechs emphasize that the Russians justify their actions in the Ukrainian republics by the former affiliation of some Ukrainian territories to Russia. Meanwhile, “X” users remind us that today's Kaliningrad was founded in 1255 by the Teutonic Knights, calling it Regiomontium in honor of the Czech king Přemysl Ottokar II, which is where the German name of the city Königsberg comes from, as well as the Polish and Czech Królewiec (Kralovec).