In 1917, Britain used Persia as the springboard for an attack into Russia in an unsuccessful attempt to reverse the Russian Revolution of 1917. The newly born Soviet Union responded by annexing portions of northern Persia as buffer states much like its Tsarist predecessor. Marching on Tehran, the Soviets extracted ever more humiliating concessions from the Persian government – whose ministers Ahmad Shah was often unable to control. The weakness of the government in the face of such aggression by an atheist foreign power sparked seething anger among many traditional Persians – including the young Ruhollah Khomeini, who would later condemn both Communism and monarchy as treason against Persia's sovereignty and the laws of Islam.