Prime Minister Benjamin Netanyahu urged Europe on Monday to impose "automatic sanctions" on Iran for accumulating more low-enriched uranium than permitted under its 2015 nuclear deal with major powers.
"I say again that Israel will not allow Iran to develop nuclear weapons," Netanyahu said, according to a statement from his office.
Follow Israel Hayom on Facebook and Twitter
"On this day I also call on all European countries to stand behind their commitments. You committed to act the moment Iran violates the nuclear agreement, you committed to activate the mechanism for automatic sanctions that was set in the [UN] Security Council," he said.
A European diplomat told Reuters there was a mechanism under the agreement to deal with "any inconsistencies," and it would be up to a joint commission of signatories to decide on the next steps.
Iran's move was the first major step in violation of the deal since the United States pulled out of it more than a year ago and reimposed tough economic sanctions on Iran.
Earlier on Monday, Israel's energy minister accused Iran of pursuing "nuclear blackmail" by stockpiling more low-enriched uranium than permitted under the deal but said that continued international pressure would cause Tehran to back down.
"It's a blatant violation of the agreement," Yuval Steinitz said on Kan public radio. "Iran is carrying out nuclear blackmail. It is saying to the world, 'Look how close we are to a nuclear weapon.'"
"Iran's economy is collapsing ... they are under atomic pressure, so they are taking unbalanced actions," he added. "If the pressure continues, and the world doesn't give in, they will give it up."
UN Secretary-General António Guterres is concerned that Iran has breached part of its 2015 nuclear deal with world powers and urged the country to continue implementing all its nuclear-related commitments, a UN spokesman said.
"Such action by the Islamic Republic of Iran would not help preserve the plan, nor secure the tangible economic benefits for the Iranian people. It is essential that this issue ... be addressed through the mechanism established by the JCPOA," UN spokesman Stéphane Dujarric told reporters.
Under the nuclear deal, formally known as the Joint Comprehensive Plan of Action [JCPOA], there is a dispute resolution process that could, within as little as 65 days, end at the UN Security Council with a so-called snapback of UN sanctions on Iran.