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Castro's administration introduced a centrally planned economy based on the production for export of sugar, tobacco, and nickel. He nationalized the property of wealthy Cubans, Americans, and other foreigners in 1960. This led to the cutting of relations by the USA, an economic embargo, and US attempts to subvert and overthrow Cuba's government. In April 1961 a Bay of Pigs invasion by US-equipped Cuban exiles was attempted but failed. In response, the USSR stationed ballistic missiles in Cuba, leading to the Cuban missile crisis of 1962 in which the USA and USSR came close to war. The stand-off ended when the USSR agreed to withdraw its missiles on condition that the USA would no longer seek to overthrow the Cuban government.