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.
2007 Iranian arrest of Royal Navy personnel
The "Persian Journal" reports that the 1975 Algiers agreement that defines the current Iran-Iraq boundary does not delimit the border beyond the shoreline into the territorial seas in the Persian Gulf, where Iran and Iraq have different approaches to the method that should be used. Iran wishes to divide its maritime boundaries on the basis of the equidistance principle, whereas Iraq believes the entrance of the Persian Gulf requires special criteria. This incident may have happened in an area that both sides consider as their own territory. Military units may have the right of innocent passage in each other's waters, but this incident involved boarding and compliance inspection and was not simple innocent passage under the 1982 United Nations Convention on the Law of the Sea.