Iran’s armed forces warned Gulf countries against assisting the US military on Wednesday, hours after the United Arab Emirates announced it was severing economic ties with Tehran following new attacks on shipping. The Gulf is dotted with US military installations, including in the UAE, which said on Tuesday that Iran had fired two ballistic missiles at vessels off its coast. Despite a recent lull in hostilities between the United States and Iran, the Strait of Hormuz – which Tehran has blockaded...