The relationship between the Soviet Union's KGB and the Cuban Intelligence Directorate was complex and marked by times of extremely close cooperation and times of extreme competition. The Soviet Union saw the new revolutionary government in Cuba as an excellent proxy agent in areas of the world where Soviet involvement was not popular on a local level. Nikolai Leninov, the KGB Chief in Mexico City, was one of the first Soviet officials to recognize Fidel Castro's potential as a revolutionary and urged the Soviet Union to strengthen ties with the new Cuban leader. Moscow saw Cuba as having far more appeal with new revolutionary movements, western intellectuals, and members of the New Left with Cuba's perceived David and Goliath struggle against US imperialism. Shortly after the Cuban Missile Crisis in 1963, Moscow invited 1,500 DI agents, including Che Guevara, to the KGB's Moscow Center for intensive training in intelligence operations.