Israel has called for new sanctions on Iran as part of a response to Iran's military and some of Tehran's allies launching an unprecedented airstrike against the Jewish state.
Israel's foreign minister, Israel Katz, said on social media that he had contacted representatives of more than 30 countries to push for sanctions against Iran's missile program and for the designation of the Iranian Revolutionary Guard Corps (IRGC) as a terrorist organization.
The United States is among several countries that have already designated the IRGC as a terrorist group. Since October, the US has imposed several packages of sanctions against Iran's ballistic missile development program after UN sanctions expired.
Israel also appears poised to demand military retaliation, despite world leaders pleading for calm.
Israeli military officials said Monday that Tehran must pay the price for Saturday's barrage of about 350 missiles and drones, many of which were launched from Iranian soil.
The Iranian attack "will be met with a response," said Israel's army chief, Lt. Gen. Herzi Halevi.
"Iran will face the consequences of its actions," he said, speaking from the Nevatim airbase in southern Israel.
Israeli military officials did not specify what that response might look like, although Israel Defense Forces spokesman Rear Admiral Daniel Hagari said the response would happen "at a time of our choosing."
Israel's rhetoric remained harsh even as the country's staunchest supporters, such as the United States, called on Israel to show restraint, arguing that the failure of Iran's drone and missile attack to do much damage was itself a huge victory.
"It's pretty telling that Iran has launched over 300 air threats ... and 99 percent of them have been shot down," said Pentagon press secretary Maj. Gen. Pat Ryder.
The White House was even harsher on Monday.
"Israel is in a much stronger strategic position today than it was just a few days ago," said White House national security spokesman John Kirby, pointing out a number of countries that have come to Israel's aid.
Britain, France, Jordan and Saudi Arabia joined the US and Israel in shooting down Iranian missiles and drones.
"Iran's vaunted missile program, something that (Tehran) used to threaten Israel and the region, has proven far less effective," Kirby said. "Israel's defense, on the other hand, has proven even better than many have long assumed."
The Pentagon said late Monday that US Defense Secretary Lloyd Austin "reiterated strong US support for Israel's defense and reaffirmed the strategic goal of regional stability" while speaking with Israeli Defense Minister Yoav Galant.
Senior US officials said Iran's attack on Israel, the first ever launched from Iranian soil, involved more than 110 ballistic missiles, 30 cruise missiles and more than 150 one-way, explosive drones.
They said that Iranian proxy forces in Iraq, Syria and Yemen also participated in the attack.
Iran, which described Saturday's strike as a success, said it was in response to an April 1 airstrike on Iran's embassy base in Syria, suspected to have been carried out by Israel, that killed seven Iranian Revolutionary Guard officers, including two senior commanders.
Some officials from Turkey, Jordan and Iraq said on Sunday that Iran had shared advance warnings of the attack to avoid mass casualties and prevent further escalation of hostilities.
But a spokesman for Iran's foreign ministry rejected such claims during a press conference in Tehran on Monday, saying: "There was no pre-arranged agreement between us and any other party."
US officials also disputed reports that Tehran's attack was meant to be symbolic.
"I've seen reports that the Iranians intended to fail, that this spectacular and embarrassing failure was intentional," Kirby said, calling such claims "categorically false."
"Given the scale of this attack, Iran's intent was clearly to cause significant destruction and casualties," Kirby said. "The goal was to get as many of them (missiles and drones) as possible through Israel's defenses."
Despite Iran's intentions, US President Joseph Biden told Israeli Prime Minister Benjamin Netanyahu that the United States would not participate in any Israeli counter-offensive against Iran.
However, various US officials said on Monday that Washington's support for Israel in the face of Iranian aggression remains "steely" and that US military assets - stationed in the region to fend off an Iranian barrage - remain in place if Tehran tries again.
Still, concerns remain that an Iranian attack and a potential Israeli response could spark a wider regional conflict.
"We call on all parties to exercise restraint," Iraqi Deputy Prime Minister Muhammad Ali Tamim said during a visit to the US State Department in Washington on Monday.
"We hope that escalations and tensions in that area will end," Tamim said, adding that Iraq does not want to see the region "drawn into a wider war that will threaten international security."
European officials also urged caution.
"We are on the edge of a cliff and we have to move away from it," Josep Borelj, the EU's high representative for foreign policy and security, told Spanish radio station Onda Sero. "We have to step on the brakes and put it in reverse".
French President Emmanuel Macron said on Monday that his government will do everything it can to avoid an escalation of the situation between Israel and Iran.
Speaking to French media outlets BFM-TV and RMC, Macron also called on Israel to work to isolate Iran, rather than escalate.
The White House confirmed later on Monday that those efforts are already underway, with members of the Group of Seven leading industrialized nations, or G7, already working on a new round of sanctions targeting industries that support Iran's missile programs.
The G7 includes Britain, Canada, France, Germany, Italy, Japan and the United States.
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