It would be considered an attack on the Western Hemisphere. The Cuban Missile Crisis of October 1962 was a straight attack between the United States and the Soviet Union during the Cold War.
The crisis was conspicuous in a number of ways, characterising calculations and miscalculations as well as direct and secret communications and miscommunications between the two sides. The conflict was also characterized by the fact that it was primarily played out at the White House and the Kremlin level.
Therefore, the attack was considered as an attack on the Western Hemisphere.
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