Iran's Revolutionary Guards said on Tuesday they would not allow "one litre of oil" ​to be shipped from the Middle East if U.S. and Israeli attacks continue, prompting a warning from President Donald Trump that the U.S. would hit Iran much harder if it blocked ‌exports from the vital energy-producing region.

The heightened rhetoric did little to quell a sharp retreat in crude prices and a rally in global shares, which came after Trump expressed confidence in a swift end to hostilities even after Iran appointed Mojtaba Khamenei as its new supreme leader in a signal of defiance.

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Trump said on Monday the United States had inflicted serious damage on Iran's military and predicted the conflict would end well before the initial four-week time frame he had laid out, though he has not defined what victory would look like.

Israel says ​its war aim is to overthrow Iran's system of clerical rule. U.S. officials mainly say Washington's aim is to destroy Iran's missile capabilities and nuclear programme, but Trump has said the war can end only ​with a compliant Iranian government.

At least 1,332 Iranian civilians have been killed and thousands wounded since the U.S. and Israel launched a barrage of air and missile strikes ⁠across Iran at the end of February, according to Iran's U.N. ambassador.



Trump warned that U.S. attacks could rise sharply if Iran sought to block tanker traffic through the Strait of Hormuz, which handles one-fifth of the world's oil ​supply.

“We will hit them so hard that it will not be possible for them or anybody else helping them to ever recover that section of the world," Trump said at a news conference on Monday.