What provoked the USSR into constructing missile bases in cuba?

The USSR constructed missile bases in Cuba primarily as a response to the United States' deployment of Jupiter ballistic missiles in Turkey, which were capable of reaching the Soviet Union. Additionally, the Cuban Revolution and the desire to protect the newly established communist regime in Cuba from potential U.S. aggression motivated the Soviet Union to strengthen its military presence in the region. This move was also aimed at challenging U.S. dominance in the Western Hemisphere and demonstrating Soviet power during the Cold War.