Foreign relations of Cuba needed oil. Relations between the countries deteriorated rapidly. In April 1961, following air attacks preparing for the Bay of Pigs Invasion by CIA-trained Cuban exiles, prime minister Fidel Castro declared Cuba to be a socialist republic, and moved quickly to develop the growing relations between Cuba and the Soviet Union. In 1962, Cuba was expelled from the Organization of American States. Shortly afterwards, many nations throughout Latin America broke ties with Cuba, leaving the island increasingly isolated in the region and dependent on Soviet trade and cooperation. Following the establishment of diplomatic ties, and after the Cuban missile crisis in
Special Activities Division Girón" in Cuba), was an unsuccessful attempt by a U.S.-trained force of Cuban exiles to invade southern Cuba and overthrow the Cuban government of Fidel Castro. The plan was launched in April 1961, less than three months after John F. Kennedy assumed the presidency of the United States. The Cuban Revolutionary Armed Forces, trained and equipped by Eastern Bloc nations, defeated the exile-combatants in three days. The sea-borne invasion force landed on April 17, and fighting lasted until April 19, 1961. CIA Paramilitary Operations Officers Grayston Lynch and William "Rip" Robertson led the first assault on the beaches, and supervised