Blocking of proposal backed by Oman signals new threat to free passage through strait vital to world economy Iran has rejected UN-backed plans for the mass evacuation of ships through the strait of Hormuz , creating a new threat to the free passage of commercial ships through the strait. The proposal, backed by Oman, was potentially the first phase of a broader Omani proposal to consult on setting up a new management of the strait based on voluntary fees and modelled on the Malacca and Singapore