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
United States involvement in regime change Sarit. It also deployed the CIA-sponsored Police Aerial Reinforcement Unit (PARU) to operations within Laos. With the help of CIA front organization Air America to airlift war supplies and with other U.S. military assistance and covert aid from Thailand, General Phoumi Nosavan's forces captured Vientiane in November 1960. The CIA orchestrated a force composed of CIA-trained Cuban exiles to invade Cuba with support and equipment from the US military, in an attempt to overthrow the Cuban government of Fidel Castro. The invasion was launched in April 1961, three months after John F. Kennedy assumed the presidency in the United States.