STORY: The United States government on Sunday said it had rescued an airman caught behind enemy lines after Iran shot down his F-15 fighter jet.

:: IRIB/ Handout via Reuters 

The downing of the plane had triggered a high-profile search by both Tehran and the U.S.

The Pentagon did not immediately respond to a request for comment.

It resolves one crisis for President Donald Trump with the war on Iran in its sixth week.

The conflict has killed thousands, sparked an energy crisis and threatens lasting damage to the world economy.

That's after Iran virtually shut the vital Strait of Hormuz.

Trump and Israel stepped up pressure on Saturday for Iran to open the strait, or face attacks on energy facilities.

The channel usually carries about a fifth of global oil and liquefied natural gas.

The U.S. president indicated his deadline for Tehran to reach a deal to end the war was around 10 a.m. ET on Monday. 

As the war has escalated, Trump has repeatedly mixed hints of diplomatic progress with threats to bomb the Islamic Republic.

Adding to the pressure, a senior Israeli defense official said Israel was preparing to attack Iranian energy facilities within the next week.

And was awaiting approval from the United States.

Iran has rained drones and missiles on Israel, while targeting Gulf countries allied to the U.S., which have avoided directly joining the war for fear of further escalation.

Chances for peace talks, which Pakistan is seeking to broker between Washington and Tehran, appear to remain slim.

And polls show low U.S. public support for the war.