Iran and the United States are preparing to start in-depth negotiations in Oman over Tehran’s rapidly advancing nuclear program, talks that likely will hinge on the Islamic Republic’s enrichment of ur

By Parisa Hafezi MUSCAT (Reuters) -Top Iranian and U.S. negotiators began a new round of indirect talks on Saturday to hammer out a deal curbing Tehran's nuclear programme, while U.S. President Donald Trump signalled confidence in clinching a new pact that would block Iran's path to a nuclear bomb.