10 most difficult Soviet Union riddles

Siqueiros was one of the most important muralists of his time. Although Siqueiros and Trótskiy were initially friends, soon they grew apart due to Siqueiros' loyalty to Stalin. The painter banded with an extremist communist group and tried to assassinate Trótskiy in his own house in Mexico City.

Baron Pyotr Nikolayevich Wrangel (1878-1928) was a Russian officer in the Imperial Russian Army and later commanding general of the anti-Bolshevik White Army in Southern Russia in the later stages of the Russian Civil War. After his side lost the civil war in 1920, he left Russia and became one of the most prominent exiled White émigrés.Wrangel is immortalized by the nickname of "Black Baron" in the marching song The Red Army .

Alexey Arkhipovich Leonov was a Soviet astronaut, general major pilot and two-time Hero of the Soviet Union. On 18 March 1965, he became the first human to conduct extra-vehicular activity, exiting the capsule during the Voskhod 2 mission for a 12-minute spacewalk.

The tank presented in this picture is a KV-85, the last of KV series (from the surname of soviet marshal Kliment Voroshilov). As the name suggests it had a 85 mm gun. Only 148 of them were built.

The Continuation War was a conflict fought by Finland and Nazi Germany, as co-belligerents, against the Soviet Union from 1941 to 1944, during World War II. Germany regarded its operations in the region as part of its overall war efforts on the Eastern Front and provided Finland with critical material support and military assistance.

Baltic states, incorporated into the Soviet Union in 1940, strongly pushed towards independence. First the lead was taken by Latvia with large demonstrations in 1986 and 1987, but Estonia and Lithuania soon joined the movement. On March 11, 1990 the newly elected parliament of the Lithuanian SSR, elected Vytautas Landsbergis to the position of Chairman of the Supreme Council. Vytautas Landsbergis promptly declared the restoration of Lithuanian independence.

The Panzerkampfwagen V Panther was a German medium tank deployed during World War II. The others were tank destroyers.

In response to the American-led boycott of the 1980 Summer Olympics in Moscow, 14 Eastern Bloc countries including the Soviet Union boycotted the Games. The IOC awarded Los Angeles the Games by default, as no other city was interested.

Before the Russian Revolution, Communist paramilitaries were often raising money through robberies and ransom kidnappings. Particularly notable was the 1907 Tiflis bank robbery, in which Stalin participated (playing minor role). The robbery resulted in 40 deaths and the theft of 341,000 rubles (equivalent to around US $3.4 million today).

As an officer of the Red Air Force during WW2, Vasily received rapid promotion. On 5 March 1942 he shot down an FW-190 and claimed another German aircraft soon after. He became Commander of the Air Force in the Moscow Military District in 1948. After the death of his father, he was considered a dangerous person and was judged in a behind-closed-doors trial. After 8 years of imprisonment, he was released in 1960, but died soon due to chronic alcoholism.