The second round of Oman-mediated U.S.-Iran indirect nuclear talks in Geneva has ended after four hours of closed-door discussions, with both sides exchanging technical proposals on the nuclear program and Iran stressing sanctions relief as a key prerequisite for any compromise. The U.S. has sought to expand the agenda to non-nuclear issues like ballistic missiles and regional military activities, which Iran firmly rejects as off the table. While both sides acknowledge the possibility of a diplomatic solution, the talks face tough hurdles amid a U.S. military buildup in the Middle East and Israel's hardline stance on the Iranian nuclear issue. Stay tuned with CGTN.