The United States launched a third night of strikes on Iran as U.S. President Donald Trump reimposed a blockade on Iranian ports and proposed that all ships pay a fee to the United States to pass through the strategic Strait of Hormuz.

U.S. President Donald Trump on Monday vowed to charge all cargo shipped through Hormuz to pay for keeping the strait open, and to reinstate a blockade on Iranian ships.

French President Emmanuel Macron on Monday said Europe was ready to defend itself and freedom with "blood" if necessary, before a meeting of Ukraine's allies to reaffirm support for Kyiv and step up pressure on Russia.

U.S. President Donald Trump said Monday the United States was "taking over" the Strait of Hormuz as fighting over the strategic waterway threatened to derail efforts to permanently end the war in the Middle East.

"We're taking over the Strait. They have nothing. They've got nothing," Trump said in an interview with "Fox and Friends," where he also complained about the tactics of Iranian negotiators seeking changes on what was agreed during hours of talks "yesterday."

Hungarian lawmakers are to vote Monday on changing the constitution to oust the president, as Prime Minister Peter Magyar pushes to loosen the grip of nationalist ex-leader Viktor Orban on the country.

Iran on Monday fired "warning shots" at two ships attempting to cross the Strait of Hormuz, state television reported, as Tehran and Washington battle for control of the strategic waterway.

The European Union on Monday imposed sanctions on Russian military intelligence officers, hackers and private companies, denouncing what it called a yearslong cyberespionage campaign to undermine the bloc.

The move targeted nine people and four entities accused of links to an online spying network that the EU said has targeted governments and carried out sabotage operations against critical infrastructure like heating and power plants since 2010.

Ukrainian President Volodymyr Zelensky was due in Paris on Monday for talks with two dozen European leaders helping Kyiv fight Russia's invasion, with the war now in its fifth year.

European foreign ministers were also meeting separately in Brussels where they were expected to discuss Ukraine's needs and Russia's threats to the continent.

Prominent U.S. Senator Lindsey Graham, a key ally of President Donald Trump, died on Saturday aged 71 following a "brief and sudden illness," his office said.

Graham, known for his foreign policy work, was a staunch supporter of the Iran war and in recent years urged both Trump and the Biden administrations to back Kyiv's fight against Russia's invasion.

Tehran announced it was closing the Strait of Hormuz on Sunday and launched missiles and drones at its Gulf neighbours, in retaliation for new U.S. strikes following an attack by Iranian forces on a merchant vessel that was abandoned in flames by its crew.