A territorial dispute over a disputed Pacific island chain, known in Russia as the Kurils and in Japan as the Northern Territories, is a key issue. Former Russian President Dmitry Medvedev said in January that Japan would have to drop territorial claims to the islands if it wanted to conclude a peace treaty. Moscow withdrew from peace treaty talks with Japan and froze joint economic projects related to the islands in 2022 because of Japanese sanctions over Russia's war in Ukraine. Relations have soured further since.