Islamic Republic of Iran Navy
It is charged with the responsibility of forming Iran's first line of defense in the Gulf of Oman and beyond with the mission of acting as an effective blue-water navy. However, it is generally considered as a conventional green-water navy as it mostly operates at a regional level, in the Persian Gulf and Gulf of Oman but also as far afield as the Red Sea, the Mediterranean Sea and northwest quarter of the Indian Ocean. In July 2016, the Navy said that it would establish a presence in the Atlantic Ocean, of unspecified duration.
Arab League–Iran relations
During the Persian Gulf War, Iran–Oman relations were damaged after Iran began running attacks on tanker movements in the Persian Gulf and placed anti-ship missile launchers along the Strait of Hormuz. The Gulf neighbors have since restored their ties and have conducted joint military exercises as recently as February 2011. Oman's leader Sultan Qaboos traveled to Iran in 2009 for the first time since Iran's 1979 revolution. Though on two occasions the U.S. has dispatched high-level officials to discuss Iran with Oman, the fact that Oman has avoided publicly expressing any concerns regarding Iran's nuclear program is likely a reason why the two states have managed to maintain strong ties.