The term 'Former Russian Leader' can be summarized by two crossword solutions: Lenin (5 letters) and CZAR (4 letters). Vladimir Lenin was a revolutionary leader who led the Bolshevik Revolution in 1917, which overthrew the Russian monarchy and established the Soviet Union. The CZAR was the title of the monarchs of Russia from 1547 to 1917. The last CZAR was Nicholas II, who was overthrown during the Russian Revolution.