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US President Donal Trump celebrated hitting what he called Iran's nuclear "bullseye", saying US attacks had done great damage to underground sites.
Trump said regime change might be needed if Tehran cannot "Make Iran Great Again".
Ali Khamenei said Iran would continue "punishing" Israel, without mentioning s response to the United States.
The UN Security Council on Sunday met to discuss "threats to international peace and security" following the US airstrikes against Iran's nuclear facilities.
Israeli Prime Minister Netanyahu says his country's campaign in Iran will end when the objectives are met. "We will not be dragged into a war of attrition."
Iran’s Foreign Minister Abbas Araghchi said the US crossed a major red line by attacking Iran’s nuclear facilities, warning Tehran will respond and blaming Washington for undermining diplomacy.
The United States executed a high-precision overnight airstrike targeting Iran’s key nuclear facilities, devastating parts of its infrastructure without aiming at military personnel or civilians, the Pentagon said Sunday.
The board of the UN nuclear watchdog will meet Monday, chief Rafael Grossi said, citing the urgent situation unfolding in Iran following the US strikes on nuclear sites.
Two Iranian F-5 fighter jets and eight ballistic missile launchers were destroyed in overnight Israeli airstrikes across central Iran, the Israeli military said Sunday.
The UN nuclear watchdog said on Sunday that it had not detected any increase in off-site radiation levels following US attacks on three nuclear facilities in Iran.
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Iranian authorities executed a young man named Mohammad-Amin Mahdavi-Shayesteh for alleged espionage on behalf of Israel on Monday morning, the judiciary's news outlet reported.
The deceased, 26, was arrested in 2023.
"According to case documents, he was the ringleader of a cyber network linked to Mossad and had knowingly cooperated with the Zionist regime’s intelligence," the judiciary said.
The judiciary also accused him of having “close ties” with Iran International TV.
Iran International denies the judiciary’s claim that the individual in question is connected to this network.
The independent NGO Iran Human Rights reported last year that the charges against him included “insulting Islamic sanctities” and “collaborating with the enemy.”
It added that the death sentence was issued following confessions obtained under torture.
Hawkish Texas Republican Senator Ted Cruz lashed out at the United Nations for criticizing a US strike on Iran on Sunday, saying it had sided with Tehran.
US President Donald Trump will meet with his national security leadership on Monday at 1 PM to talk over the aftermath of US strikes on Iranian nuclear sites, Axios reporter Barak Ravid said on Sunday.
"Monumental Damage was done to all Nuclear sites in Iran, as shown by satellite images. Obliteration is an accurate term!" US President Trump said.
"The white structure shown is deeply imbedded into the rock, with even its roof well below ground level, and completely shielded from flame. The biggest damage took place far below ground level," he added, not appearing to cite any image.
"Bullseye!!!"
Australian Foreign Minister Penny Wong said on Sunday that the country supports the US attack on Iranian nuclear facilities while calling for calm and diplomacy.
“We support action that the US has taken to prevent Iran from obtaining a nuclear weapon,” Wong told a local television interviewer.
International oil prices shot up $4 before settling back down to a gain of around $2 a barrel in early Asian trading Monday local time after US attacks on Iranian nuclear sites.
The increase reflects market concerns that the Persian Gulf, the world's main artery of energy flows, could be endangered or shut if Washington and Tehran clash.
Iranian Supreme Leader Ali Khamenei vowed in harsh terms to keep up its "punishment" of Israel in an X post on Satuday, his first comments since US bombings on Iranian nuclear sites.
"#RightNow," a post on Khamenei's account wrote: "The punishment continues"
"The Zionist enemy has made a grave mistake, committed a major crime; it must be punished—and it is being punished. It is being punished right now. #AllahuAkbar".
Khamenei made no mention of attacking US targets.
Protests were held on Sunday in far-flung cities against the US attack on Iran's nuclear sites.