U.S. Secretary of State Marco Rubio is set to travel to Gulf Arab states to brief officials on Washington’s proposed “Iran reset,” a diplomatic effort aimed at easing tensions with Iran. Multiple reports say Rubio’s task is difficult because Gulf leaders remain wary that the deal could involve substantial U.S. concessions—reported in one outlet as up to US$300 billion—that they fear would strengthen Tehran rather than reduce threats. The Gulf states also worry the arrangement could shift the regional security balance and affect oil-related dynamics.

According to the Reuters-linked account cited by one outlet, Rubio meets Gulf leaders in the United Arab Emirates on Tuesday, before traveling to Kuwait and Bahrain. He is expected to consult officials tied to the Gulf Cooperation Council (GCC), a regional bloc that includes Saudi Arabia, Qatar, Oman, and other monarchies.

One source also notes that GCC states have previously offered logistical support to the United States during periods of heightened regional tension, including the US-Israeli war involving Iran. Across the coverage, the common theme is that Gulf governments are closely scrutinizing what Rubio’s approach would deliver and how any concessions could reshape their security and regional interests.