This country invaded Manchukuo after winning the Battle of Stalingrad during World War II.
Sidney Reilly was killed in this nation after being duped by the OGPU during Operation Trust. This nation has been accused of perpetrating the Holodomor. One leader of this country appointed the "Bloody Dwarf" as the head of his secret police after ordering the Trial of the Twenty One during the Great Purges. This nation's early history saw the replacement of the New Economic Policy with the Five Year Plans. This country invaded Manchukuo after winning the Battle of Stalingrad during World War II. For 10 points, name this former superpower that was founded after the 1917 Russian Revolution, and was led for over thirty years by Joseph Stalin.
Sidney Reilly was killed in this nation after being duped by the OGPU during Operation Trust.
Union of Soviet Socialist Republics [or Soviet Union, prompt on "Russia"]