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said on Tuesday that Athens had ordered the release of from a Russian-flagged tanker, after a Greek court ruled it must be returned despite US demands.

"The Greek government issued the relevant order, and now we are witnessing the lifting of the ship's seizure and the return of the cargo to its owner," the Ports and Maritime Organization of Iran said in a statement.

The has yet to confirm the move.

On Thursday, a Greek government official said a regional court in the country had ruled that Iranian oil seized in April from the Russian-flagged tanker, the Pegas, must be returned.

The official said Athens had been "very hopeful" the move would lead to the release of that Iran seized last month in retaliation.

The Pegas had been moored near the Greek island of Evia when its cargo was seized in line with European Union sanctions imposed against Russia following its invasion of Ukraine in February.

According to information at the time, the tanker had been carrying .

The Pegas was later renamed the Lana, and Greek authorities said the ship and its crew would be released.

But the oil was held at the behest of the US Justice Department, and a process to transfer the cargo to a US-chartered vessel had been underway.

on May 27 boarded and seized two Greek-flagged oil tankers in the Gulf.

Iran's supreme leader Ayatollah Ali Khamenei said last week the seizure of the two tankers was retaliation against Greece because it "stole" Iranian oil.