Marco Rubio has succinctly described what is happening in Cuba

Based on the request of Pakistan and other countries, the tremendous military success we have achieved during the campaign against Iran, and, furthermore, the great progress made toward a complete and final agreement with representatives of Iran, we have mutually agreed that—while the blockade will remain in full force—Project Freedom (the transit of vessels through the Strait of Hormuz) will be suspended for a brief period to determine whether the agreement can be finalized and signed. President DONALD J. TRUMP