What did the U. S. do when they realized there were Russian missiles in Cuba?

The US established a naval blockade on October 22 to prevent further missiles from reaching Cuba; Oval Office tapes during the crisis revealed that Kennedy had also put the blockade in place, as an attempt to provoke Soviet-backed forces in Berlin as well.[3][4][5] The US announced it would not permit offensive weapons to be delivered to Cuba and demanded that the weapons already in Cuba be dismantled and returned to the Soviet Union.

After days of negotiating agreement was reached by President John f Kennedy Soviet’s would dismantle weapons and return