It happened half a century ago. And a good cigar was enjoyed by both:

From Wikipedia: Sartre went to Cuba in the 1960s to meet Fidel Castro and spoke with Ernesto “Che” Guevara. After Guevara’s death, Sartre would declare him to be “not only an intellectual but also the most complete human being of our age” and the “era’s most perfect man.” Sartre would also compliment Che Guevara by professing that “he lived his words, spoke his own actions and his story and the story of the world ran parallel.”