evidence: Since 1971, the dispute has been a key element of UAE diplomacy in Arab forums and in the international community, serving to bind the country's disparate federation whose members, though notionally equal, vary widely in terms of oil wealth. Abu Musa is claimed by Sharjah, the third largest member of the UAE after Abu Dhabi and Dubai. The other two mainly uninhabited islands of Greater and Lesser Tunb are claimed by Ras al-Khaimah, another emirate in the seven-member union. On November 13, 1971, the ruler of Sharjah reluctantly accepted an interim deal with Iran, which led to the sharing of the Abu Musa's offshore oil revenues. While both sides continued to claim full sovereignty, Iran changed the status quo in 1992 by restricting UAE access and dramatically increasing Iranian presence on the islands, including military. Although the UAE and Iran have partially agreed on a continental-shelf boundary between the two countries, the agreement does not include the area around the islands.