The EU's top diplomat warned Monday it would be "extremely dangerous" should Iran shut down the crucial Strait of Hormuz trading route over U.S. strikes on its nuclear sites.

"Any Iranian closure of the Strait of Hormuz would be extremely dangerous," Kaja Kallas wrote on X, as EU foreign ministers met in Brussels for talks with the Iran-Israel conflict high on the agenda.

Shortly after U.S. B-2 bombers began their return to the U.S. after they struck Iran’s key nuclear facilities, U.S. President Donald Trump called Israeli Prime Minister Benjamin Netanyahu to brief him on the strike, U.S. and Israeli officials told U.S. news portal Axios.

Russia fired 352 drones and 16 missiles at Ukraine overnight, killing at least seven people in the capital Kyiv and its suburbs, Ukrainian President Volodymyr Zelensky said on Monday.

"In total, 352 drones were launched, including 159 (Iranian-designed) Shaheds just overnight, along with 16 missiles. Preliminary reports indicate that ballistic weapons from North Korea were also used," Zelensky said on social media.

Iran said Monday the attacks launched on the Islamic republic during talks about its nuclear program were a "betrayal of diplomacy".

"We and future generations will not forget that the Iranians were in the middle of a diplomatic process with a country that is now at war with us," said foreign ministry spokesman Esmaeil Baqaei.

Iran's Foreign Minister Abbas Araghchi on Sunday condemned US attacks on key nuclear sites as "outrageous" and said his country has a right to defend its sovereignty.

"The events this morning are outrageous and will have everlasting consequences," he posted on X, adding that the attacks were "lawless and criminal" behaviour.

The U.N.'s International Atomic Energy Agency (IAEA) on Sunday said that it had not detected any increase in radiation levels at key nuclear sites in Iran following U.S. air strikes.

U.S. President Donald Trump said U.S. air strikes on Sunday "totally obliterated" Iran's main nuclear sites, as Washington joined Israel's war with Tehran in a flashpoint moment for the Middle East.

In a televised address to the nation from the White House, Trump warned that the United States would go after more targets if Iran did not make peace quickly.

U.S. President Donald Trump said overnight that Iran had a "maximum" of two weeks to avoid possible U.S. air strikes, indicating he could take a decision before the fortnight deadline he set a day earlier.

The success of a key NATO summit hung in the balance on Friday, after Spain announced that it cannot raise the billions of dollars needed to meet a new defense investment pledge demanded by U.S. President Donald Trump.

Trump and his NATO counterparts are meeting for two days in the Netherlands from next Tuesday. He insists that U.S. allies should commit to spending at least 5% of gross domestic product, but that requires investment at an unprecedented scale.

A Russian missile strike on a nine-story Kyiv apartment building was a sign that more pressure must be applied on Moscow to agree to a ceasefire, Ukrainian President Volodymyr Zelensky said Thursday, as Moscow intensifies attacks in the war.

The drone and missile attack on Kyiv early Tuesday, the deadliest assault on the capital this year, killed 28 people across the city and wounded 142 others, Kyiv Military Administration head Tymur Tkachenko said.