Which Participants of World War II Are Technically Still at War?

Russia and Japan are technically still at war as they never signed an
official peace treaty after World War II.

Although World War II ended for all practical purposes in 1945, it is still
technically ongoing as two participants, Russia and Japan, have never
signed a peace treaty. The cause is the dispute between the two nations
over the Kuril islands, a chain of islands in the Pacific Ocean, stretching
between Japan and Russia.
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