Which Soviet foreign minister delivered the declaration of war against Japan on August 8, 1945?

Vyacheslav Molotov delivered the Soviet declaration of war against Japan on August 8, 1945.

Molotov informed Japanese ambassador Naotake Satō in Moscow that the Soviet Union had declared war and would consider itself at war with Japan from August 9. Soviet forces then began their invasion of Japanese-held Manchuria shortly after midnight on August 9, using several fronts.

The Soviet entry came between the atomic bombings of Hiroshima and Nagasaki. It fulfilled a commitment made by Joseph Stalin at the Yalta Conference to enter the Pacific war within three months of Germany's defeat. Japan had hoped that the Soviet Union might mediate a negotiated settlement, but Moscow instead joined the war against Japan.

Molotov was the Soviet foreign minister, while Stalin was the country's leader. Confusing those roles produces a plausible but incorrect answer. The declaration and invasion added a major military and diplomatic shock during Japan's final surrender discussions.