Under border changes promulgated at the Potsdam Conference in 1945, northern East Prussia, including Gumbinnen, became part of the Russian Federation, and the town ’ s name was changed to Gusev, in honor of a Red Army captain, Sergei Ivanovich Gusev, who was killed in action near Gumbinnen in January 1945.

Under border changes promulgated at the Potsdam Conference in 1945, the former German Memelland, with its Baltic port Memel ( Lithuanian: Klaipėda ), was again transferred to Lithuania, or as it was after 1945 the Lithuanian SSR.

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