A warning Iran has more ways to inflict economic pain if war resumes with the US, other than in the Strait of Hormuz.

Donald Trump's threatening a navy blockade of the shipping lane from 2am NZT after talks in Pakistan have brought no deal.

Iran says military vessels approaching the Strait will be dealt with severely.

Reuters Middle East correspondent Alexander Cornwell says UAE and Saudi Arabian oil terminals could be at risk.

"The Iranians have proven that they have the capability of hitting both of these sites - and there is also the question of Yemen's Houthis and whether they will try, once again, to close or restrict the Red Sea."

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