US President Donald Trump on Monday that the war against Iran could end soon, but threatened to escalate if Iran blocked oil shipments from the Middle East.

In a CBS News interview, he said he thinks ​the war "is very complete" and that Washington was "very far ahead" of his initial four- to five-week estimated ​timeframe. 

However, he threatened Tehran with "death, fire, and fury" if it disrupts shipping in the Strait of Hormuz.

“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.

Trump said the United States had inflicted serious damage on Iran's air force and navy 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.

In response, Iran's Revolutionary Guards said it would not allow "one litre of oil" to leave the region if attacks ​from the United States and Israel continue.

"We are the ones who will determine the end of the war," a spokesperson said, according to state media.

Responding to French President Emmanuel Macron’s comments about planning for a defensive escort mission to restore shipping in the Strait of Hormuz, Iran's security chief Ali Larijani said: “It is unlikely that any security will be achieved in the Strait of Hormuz amid the fires of the war ignited by the United States and Israel in the region.”