TEHRAN, Iran — Iran’s state TV has broadcast footage purporting to show a close encounter between the Revolutionary Guard’s navy and the USS Theodore Roosevelt early this year.

Press TV’s website said the encounter occurred March 21 in the strategic Strait of Hormuz in the Persian Gulf, the passageway for nearly a third of all oil traded by sea.

The TV agency said the video was aired Saturday as part of a documentary.

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The footage is likely meant as a show of strength amid new US sanctions on Iran and the Trump administration plans to bring Iranian oil exports down to zero.

In the video, Guard speedboats are seen closing in on the US carrier.

Iranian sailors then warn the Americans over radio communication to “keep well clear” of the Guard patrol boats and say they advise the Americans to “refrain from the threat or use of force in any manner.”

Newly released footage from #Iran's state media shows a previously unreported close encounter between #IRGC speedboats and the USS Theodore Roosevelt in the Strait of Hormuz in March of this year. No comment from the @USNavy yet. pic.twitter.com/wXjMxhkNR8 — Séamus Malekafzali (@Seamus_Malek) September 29, 2018

There was no immediate comment from the US Navy.

Iranian harassment of US ships in the Gulf was a regular occurrence, but according to the US Navy, the practice declined sharply after the election of US President Donald Trump in 2016 and had totally stopped by 2018.

Administration officials have touted the drop in confrontations as proof that Washington’s hard line toward the regime brought about a change in behavior.