 In Algiers , Algeria , on February 24 , 1965 , Guevara made what turned out to be his last public appearance on the international stage when he delivered a speech at an economic seminar on Afro @-@ Asian solidarity . He specified the moral duty of the socialist countries , accusing them of tacit complicity with the exploiting Western countries . He proceeded to outline a number of measures which he said the communist @-@ bloc countries must implement in order to accomplish the defeat of imperialism . Having criticized the Soviet Union ( the primary financial backer of Cuba ) in such a public manner , he returned to Cuba on March 14 to a solemn reception by Fidel and Raúl Castro , Osvaldo Dorticós and Carlos Rafael Rodríguez at the Havana airport . 
