MANAMA -- US Secretary of State Marco Rubio said that a new round of US-Iran technical negotiations will resume in Switzerland at the end of June, as he wrapped the second day of a high-stakes Persian Gulf tour aimed at calming regional concerns over Washington’s tentative accord with Tehran.“The technical group will be back, I believe, on the 29th or the 30th,” Rubio told RFE/RL in Kuwait on June 24 before arriving in Bahrain, outlining the next phase of talks involving US State Department and Department of Energy experts focused on sanctions, nuclear issues and implementation mechanisms.His comments laid out Washington’s next steps in implementing the interim US-Iran memorandum of understanding, underscoring efforts to move quickly from a fragile truce toward a broader agreement.Reassuring Gulf AlliesRubio’s Gulf swing -- through the United Arab Emirates, Kuwait, and now Bahrain -- has focused heavily on reassuring Arab allies still wary of the agreement, particularly after enduring direct Iranian missile and drone strikes during the four-month conflict.In Abu Dhabi, Rubio held a working lunch with UAE President Mohammed bin Zayed Al Nahyan, national-security adviser Tahnoun bin Zayed Al Nahyan and Foreign Minister Abdullah bin Zayed Al Nahyan, where discussions centered on the Iran memorandum, regional stability, and security guarantees.