Negotiators from the United States and Iran are attempting to bridge deep divides over nuclear enrichment and sanctions relief.

Iran wants economic sanctions lifted and its right to nuclear energy formally recognized. The US demands a full halt to uranium enrichment and restrictions on Iran’s missile program.

The indirect talks, mediated by Oman, have been described as serious but difficult.

At the same time, US military forces have expanded their presence in the region, including two carrier strike groups and advanced fighter aircraft deployed to Israel.

The parallel tracks of diplomacy and military pressure underscore the fragile balance currently in place.