The Globe and Mail reports in its Friday edition that the Prime Minister of U.S. ally Qatar visited Tehran on Thursday in a bid to revive diplomacy as the U.S. and Iran traded recriminations over Washington's latest sanctions drive, described by one Iranian official as "all-out economic war." A Reuters dispatch to The Globe says the Gulf neighbour of Iran has served as a back-channel negotiator for the warring parties and played a direct role in securing a June ceasefire that briefly led to a cessation of hostilities. The visit comes as the war nears its sixth month with fighting largely paused but no diplomatic breakthrough in sight. Both sides are at odds over control of the Strait of Hormuz, which Tehran has used as leverage. The White House said there were currently no negotiations between the United States and Iran as Tehran had not yet "come to the table in a meaningful way." Iran has repeatedly said it has never left the negotiating table. Qatar's Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani held talks in Tehran with Iranian Foreign Minister Abbas Araqchi. The two discussed a proposed phased framework that includes establishing a temporary joint Iranian-Omani shipping corridor through the strait.