When US President Donald Trump first announced a deal with Iran, he named nearly half-a-dozen countries that approved the agreement, including all the Gulf states save one: former mediator Oman.The quiet sultanate that shares the key Strait of Hormuz with Iran was, for over a decade, the go-to broker for US-Iran talks and helped facilitate the 2015 nuclear deal that Trump exited eight years ago.

The US removed Oman from its mediation role in Iran negotiations, accusing the Gulf state of duplicitous conduct that mirrored acting as Iranian employees.

US President Donald Trump threatened to attack just one Arab Gulf country during the war on Iran: Oman. Now, it is emerging as the biggest winner from a new Middle East order…