US expels Oman from mediation talks, threatening 3 diplomatic tracks

The US expelled Oman from mediation negotiations Wednesday, accusing the Gulf sultanate of acting duplicitously as a go-between, a move that threatens three active diplomatic tracks. "Oman has been playing both sides, undermining the very process it was meant to facilitate," a senior US State Department official said, without providing specific evidence of the alleged double-dealing.

Oman has served as a critical backchannel for Washington's most sensitive regional negotiations for decades, including indirect talks with Iran over its nuclear program and efforts to sustain a ceasefire in Yemen. The sultanate's position on the Strait of Hormuz — through which about 21 percent of global oil supply transits — has long made it an indispensable intermediary between Tehran and Western capitals. Under Sultan Haitham bin Tariq, who took office in 2020, Oman maintained the neutralist foreign policy established by his predecessor, positioning Muscat as the region's most trusted diplomatic broker. The last time a regional mediator was sidelined in a comparable manner, during the 2019 Gulf tanker attacks, Brent crude spiked more than 10 percent within two weeks as diplomatic channels collapsed and the US deployed additional naval assets to the Persian Gulf.

The expulsion removes Washington's most reliable line of communication to Iran at a time when nuclear negotiations remain stalled. Tehran has previously insisted on Oman as a venue for any direct or indirect talks with the US, meaning the loss of Muscat's good offices could delay or derail future engagement. For Yemen, Oman's mediation was instrumental in securing the 2022 truce between Saudi-backed forces and the Houthi movement, and its absence raises the risk of renewed hostilities along the Red Sea shipping corridor that handles about 12 percent of global maritime trade.

The decision carries immediate market implications across multiple asset classes. Brent crude could see a risk premium of $3 to $5 per barrel on heightened Middle East uncertainty, while gold may attract safe-haven flows as investors reassess regional stability. The US dollar index could strengthen on geopolitical risk aversion, mirroring patterns seen after the 2019 Abqaiq-Khurais attacks when the greenback gained more than 1 percent in the following week. Defense sector stocks with exposure to Gulf security contracts could benefit from expectations of increased US military posture in the region, while emerging-market currencies in the Gulf could face selling pressure.

The coming weeks will test whether alternative mediators can fill the void left by Oman's departure. Qatar, which has maintained ties with a broad range of regional actors including the Taliban and Hamas, has positioned itself as a potential replacement, while the United Arab Emirates has deepened its diplomatic engagement with Tehran in recent months. Neither, however, commands the same level of trust from both Washington and Tehran that Oman cultivated over decades of quiet diplomacy. The US has not indicated whether it will seek a replacement mediator or shift to direct bilateral engagement with Iran.

This article is for informational purposes only and does not constitute investment advice.