I personally don't think Raul Castro's Cuba (Or Fidel Castro's Cuba) were ever actually Socialist in the first place.
Castro wasn't actually a Communist when he took power in Cuba. During his American visit after the Cuban revolution he assured the American Imperialists that he was not a Communist:
"I am not a Communist, nor do I agree with communism". (Fidel Castro" 'Meet the Press' Programme, in: 'Castro'; Paul Humphrey: Hove; 1981; p. 42-43).
"Dr.Fidel Castro . . . went before the National Press Club here today to repeat his assurances made so often during his visit to the capital that he means nothing but friendship to the United States, that there are no Communists in his Government, that he has no plans to expropriate any foreign holdings in Cuba"., ('Times', 21 April 1959; p. 11)."
After leaving the USA, on 21 May 1959 Castro described Communism as a system :
"Which suppresses liberties, the liberties which are so dear to man." (Fidel Castro, in: 'Revolucion, 21 May 1959, in: Theodore Draper (1965): op. cit,; p. 37
Castro just kind of "randomly" became a Communist when the Soviet Union offered better economic deals then there American counter-parts.
For most of the existence of the young Republic, Cuba took on the status of a Soviet Neo Colony. Most of the Cuban economy was based on the production of sugar cane to be shipped to the Soviet Union and the Eastern Bloc. Marxist-Leninist Che Guevara opposed this of course pointing out that Cuba was becoming a Soviet Neo Colony.
"Under-development or distorted development, carries with it a dangerous specialization in raw materials, containing a threat of hunger for all our people. We, 'the underdeveloped', are those of the single crop, the single product, and the single market. A single product whose uncertain sale depends upon a single market, which imposes and sets conditions. This is the great formula of imperial economic domination which is combined with the old and always useful Roman formula, 'divide and conquer". (Ernesto Guevara: 'Cuba - Exception or Vanguard?', in: John Gerassi (Ed.): op. cit.; p. 135).
Castro however continued with the Soviet Social-Imperialist pleasing economic model:
"Castro announced . . . that his whole new economic policy was postulated on a spectacular increase in sugar production, aimed at reaching 10 million tons by 1970. Agricultural diversification went backward instead of forward. For example, rice production had advanced to a high point of 181,000 tons in 1957, two years before Castro, and plunged to 95,400 tons in 1962, after three years of Castro. Cuba had been forced to reorganize its entire economy'. (Theodore Draper (1965): pop. cit.; p. 172, 227, 230).
After the land reforms Agricultural cooperatives were established but they were by no means Socialist and by no means cooperatives. They did not have members who administered them and divided the profits among themselves; the workers were state employees who received a wage.
There are plenty of other reasons why Cuba was never Socialist but I'm done for now comrade