Svmuu A source familiar with the matter revealed to Reuters on Friday that a Qatari negotiation delegation arrived in Tehran on Friday in coordination with the United States, aiming to help facilitate an agreement to end the war between the US and Iran and resolve outstanding issues. Qatar has previously acted as a mediator in the Gaza war and other international tensions, but has so far refrained from playing a mediating role in the Iran conflict after being targeted by Iranian missile and drone attacks in the recent hostilities. (Jinshi)