BlockBeats News, May 22nd - A source familiar with the matter told Reuters on Friday that a Qatari negotiating team arrived in Tehran on Friday under U.S. coordination to assist in brokering a deal to end the U.S.-Iran war and address unresolved issues. Doha has previously acted as a mediator in the Gaza war and other international crises, but has so far avoided playing a mediating role in the Iran conflict following Iranian missile and drone attacks in the recent escalation of tensions. (FX168)