A U.S. armada including two aircraft carriers moved into the Persian Gulf Wednesday, amid increasing threats from the U.S. and increasing defiance from Iran this week. The International Atomic Energy Agency (IAEA) also this week stated that Iran has stepped up uranium enrichment in the face of U.N. Security Council sanctions and calls for a halt to Iran’s nuclear program. The large U.S. naval force includes amphibious assault vessels with over 2,000 U.S. Marines.