Singapore’s Foreign Minister Vivian Balakrishnan said passage through the straits of Malacca and Singapore, a key trade chokepoint brought into focus by the war in Iran, must remain free for all and that the city-state won’t support any efforts to restrict it.

"The right of transit passage is guaranteed for everyone,” Balakrishnan said in an interview at a CNBC event in Singapore. "We will not participate in any attempts to close or interdict or to impose tolls in our neighborhood.”