Arriving in Abu Dhabi late on Tuesday for a three-day Gulf trip, Rubio is undertaking his first high-level diplomatic mission on the agreement reached last week to end the four-month-old war.Follow us on GoogleUS Secretary of State Marco Rubio speaks with UAE Ambassador to the US Yousef Al Otaiba upon his arrival at Al Bateen Executive Airport to discuss the interim deal between the US and Iran with Arab Gulf allies, in Abu Dhabi, United Arab Emirates, June 23, 2026.(photo credit: REUTERS/Eric Lee)ByREUTERSJUNE 24, 2026 09:56Updated: JUNE 24, 2026 10:18US Secretary of State Marco Rubio begins a Middle East tour in earnest on Wednesday, seeking to reassure Gulf allies who view concessions in President Donald Trump’s Iran deal that include a proposed $300 billion fund as too generous to a regional foe.Arriving in Abu Dhabi late on Tuesday for a three-day Gulf trip, Rubio is undertaking his first high-level diplomatic mission on the agreement reached last week to end the four-month-old US-Israeli war with Iran.Asked on arrival if he planned to address allies' disquiet with the accord, Rubio told reporters: "That most certainly will come up in these discussions." He said they would also discuss issues not covered by the memorandum of understanding.America's top diplomat has been largely absent from Iran-related discussions in recent weeks, with Vice President JD Vance instead leading a round of talks with Iranian counterparts over the weekend in Switzerland.Rubio's remarks during his swing through the region will be closely scrutinized to see how the man once known as a hawkish critic of Iran frames a deal that many congressional Republicans argue amounts to capitulation.US Secretary of State Marco Rubio speaks to the media upon his arrival at Al Bateen Executive Airport to discuss the interim deal between the US and Iran with Arab Gulf allies, in Abu Dhabi, United Arab Emirates, June 23, 2026. (credit: REUTERS/Eric Lee)A delicate mission: Defend Trump deal, address Iran concernsRubio and Vance, both former US senators, are widely viewed within Republican Party circles as potential candidates to succeed Trump, with party insiders and early polling often casting the race as a two-way contest between them.Rubio's mission is delicate: While he needs to defend a preliminary accord that Trump firmly supports, he also has to credibly address the concerns of his Gulf counterparts, who are more circumspect about the deal.While Gulf leaders pushed for peace during the four-month-long conflict, many were surprised and disappointed by the terms of the accord.US regional allies are especially concerned that Iran could use the proposed $300 billion reconstruction fund to rebuild its military. The accord also does not address Tehran's ballistic missile capacity, a concern for Gulf states, all of which were struck by Iranian missiles and drones in the war.Tehran has noted that the Gulf states made various logistical accommodations for Washington's war effort, while hosting US military bases that were central to the conflict.UAE, Kuwait host strategic US military bases, hit by Iranian missilesAmong the countries Rubio is visiting are the United Arab Emirates and Kuwait. Both nations host strategic US military bases, and both were hit by an onslaught of Iranian missiles, resulting in civilian deaths.The UAE faces particularly severe economic strains, as the war caused thousands of expatriates at the core of its non-oil economy to flee, provoking questions about the long-term viability of an expanding global financial center so close to a country that attacked it.Last week, Reuters reported that Iran set up secretive new cells in Iraq to carry out attacks on Gulf countries, including Kuwait and the UAE.Those cells carried out at least ​seven drone attacks against sites in Kuwait, the UAE, and Saudi Arabia during a roughly one-month period in April and May, Reuters reported.Follow us on Google