According to wikipedia "Japan and the Soviet Union ended their formal state of war with the Soviet–Japanese Joint Declaration of 1956 but did not sign a peace t

According to wikipedia "Japan and the Soviet Union ended their formal state of war with the Soviet–Japanese Joint Declaration of 1956 but did not sign a peace treaty." https://en.wikipedia.org/wiki/Kuril_Islands_dispute https://en.wikipedia.org/wiki/Kuril_Islands_dispute https://en.wikipedia.org/wiki/Soviet%E2%80%93Japanese_Joint_Declaration_of_1956 https://en.wikipedia.org/wiki/Soviet%E2%80%93Japanese_Joint_...