Reuters Yonhap News U.S. President Donald Trump celebrated the reopening of the Strait of Hormuz after signing a memorandum of understanding (MOU) with Iran last month. “Ships around the world, start your engines. Let the oil flow,” he wrote on social media. However, contrary to his claims, the current MOU is being used as a basis for Iran to claim the legitimacy of closing the strait. The U.S. signed an MOU specifying Iran's right to control the strait.