WASHINGTON/TEHRAN (Kyodo) -- The United States will resume a blockade on maritime traffic to and from Iran's ports and coastal areas, President Donald Trump said Monday, at a time when fresh exchanges of fire between the two countries have raised fears of a return to war in the Middle East.

Trump said on social media that the United States will be the "guardian" of the Strait of Hormuz by reinstating the blockade, targeting only Iran's vessels or clients. The U.S. military said it will resume the blockade on Tuesday.

"But as such, and as a matter of FAIRNESS, (the United States) will be reimbursed, at the rate of 20 percent on all cargo shipped, for any and all costs necessary to do the job of providing safety and security to this very volatile section of the World," he wrote.

His remarks came after Iran's Islamic Revolutionary Guard Corps on Sunday announced the closure once again of the strait, a critical shipping lane for the world's oil and gas supplies.

The U.S. plan to charge ships from all other countries for safe passage through the strait contradicts Trump's earlier position that the narrow waterway should be open without tolls.

The plan, if realized, would have a significant impact on Japan and many other Asian countries that are highly dependent on the shipping route for energy supplies.

Iranian military authorities warned that they would not tolerate U.S. interference in the strait's management. Trump insisted that the key chokepoint remains open.

Iran's state TV reported that the country's military attacked U.S. facilities in Kuwait with drones and a U.S. vessel with missiles.

Iran's Foreign Minister Abbas Araghchi ridiculed Trump, saying he is "absolutely right. Whoever provides secure and safe passage of commercial vessels through the Strait of Hormuz should be compensated for this service."

"Iran has always been the GUARDIAN of the Strait and will remain so FOREVER," Araghchi wrote on the social media platform X, adding that "20 percent is of course too much. We will be fair."

The renewed military and verbal attacks between the United States and Iran have been taking place despite a preliminary peace deal signed by the two countries in mid-June after months of hostilities.

The so-called memorandum of understanding called for the fighting to stop and the Strait of Hormuz to be reopened, while extending their ceasefire for 60 days to negotiate a final deal to end the war, which the United States and Israel started in late February.

On Monday, the U.S. military's Central Command said it began launching the third straight night of strikes against Iran.

"We're hitting them very heavy tonight," Trump later told reporters at the White House. "We'll see what happens but we're knocking out all of their offensive capability, and we're controlling the strait."