Ka cika wannan jumla: Ƙarin matsayin Castro a fagen duniya ya sa dangantakarsa da Soviet, a yanzu a ƙarƙashin shugabancin Leonid Brezhnev. Da yake tabbatar da 'yancin Cuba, Castro ya ki sanya hannu kan Yarjejeniyar kan Rashin Yada Makaman Nukiliya, yana mai cewa yunƙurin Soviet-US ne don mamaye Duniya ta Uku. A biyun, Aníbal Escalante mai biyayya ga Soviet ya fara shirya cibiyar sadarwar gwamnati ta adawa da Castro, kodayake a watan Janairun 1968, an kama shi da magoya bayansa saboda wuce sirrin jihar zuwa Moscow. A ƙarshe Castro ya yi biyayya ga matsin lamba na Brezhnev don yin biyayya, kuma a watan Agusta na 1968 ya la'anci Prague Spring a matsayin jagorancin "fascist masu tayar da hankali" kuma ya yaba da
Soviet mamayewa na Czechoslovakia. Tasirin Babban Tsalle-tsalle na China, a cikin 1968 Castro ya ayyana Babban Juyin Juya Halin, ya rufe duk sauran shagunan masu zaman kansu da kasuwancin da suka rage kuma ya la'anci masu mallakar su a matsayin masu adawa da juyin juya hali na jari-hujja.