This image of Fidel Castro and Nikita Khrushchev was taken during Castro's visit to The Soviet Union in May of 1963 (about 7 months after the Cuban Missile Crisis).
From a nonverbal perspective, this is a very illustrative moment - for although Castro was significantly taller that Khrushchev (Some sources report Fidel was 6'3" [1.91 m] to Nikita's 5'3" [1.60 m] although in most photos Castro appears to be only 7 or 8 inches taller [17.8 cm - 20.3 cm]), the Soviet leader's hand is positioned on top of the Cuban's - and moreover it was Khrushchev (the Alpha) who lifted Castro's (the Beta) hand - not the other way around.
This Hand-on-Top configuration (as well as the dynamic act of lifting another person's hand) are together very classic body language displays of dominance on the part of the stronger Khrushchev to his subordinate Castro.
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