Kuril Islands landing operation

Battle context

The Soviet seizure of the Kuril Islands in 1945 represented the northernmost territorial gain of the Soviet–Japanese War. The operation became viable only after earlier Red Army successes at Mutanchiang and during the invasion of South Sakhalin created the conditions necessary for an amphibious advance into the island chain. It was also shaped by a strategic recalculation: Soviet planners had initially considered landing on Hokkaido, and the shift to the Kurils defined the final geographic limit of Soviet expansion in the Pacific theater. With a Japanese garrison of roughly 80,000 facing a Soviet landing force of around 15,000, the operation resulted in roughly comparable casualties on both sides — just over 1,000 each — suggesting determined resistance despite the broader collapse of Japanese resistance elsewhere. The islands remained under Soviet and later Russian control, making the operation one of the most territorially consequential actions of the final days of World War II in the Pacific.