Königsberg was part of Germany when annexed by Soviet Union. I see no page about Königsberg in Czech language at Wikipedia at all. Anyway, Germans were expelled, so Königsberg is populated by Russians now, which makes it similar to Transnistria, Crimea, etc.

Last October, a petition for the Czech republic to annex the region received over 20k signatures. This led to many jokes: https://www.petice.com/petice_za_vyhlaeni_referenda_o_pipoje...