United States President Donald Trump has warned Israeli Prime Minister Benjamin Netanyahu that he might find himself fighting on his own if Israel returns to war with Iran.

The warning on Monday came as Israel and Iran said they would pause attacks following their most serious escalation since a ceasefire took effect in April.

Trump, who has reportedly grown increasingly exasperated with Netanyahu, demanded that both sides stop “shooting” in a post on his Truth Social platform and said that “final negotiations” towards peace would proceed “subject to ignorance or stupidity getting in its way”.

He also called Netanyahu and told him to stop the strikes, according to media reports.

In an interview with Axios, Trump said he had warned Netanyahu about the consequences of continuing the war.

“I said, ‘Bibi, you better be careful, or you will be on your own very soon’,” Trump said.

The flare-up began on Sunday, triggered by Israel’s deadly bombardment of Lebanon’s capital, Beirut. Iran – which has long said any peace deal with the US depends in part on an end to the fighting in Lebanon – responded with a wave of missiles at northern Israel.

Trump reportedly called Netanyahu on Sunday evening and asked him not to retaliate, but Israel launched attacks on Iran early on Monday.

Israeli forces struck Iranian air defence systems and a petrochemical plant, while Iran retaliated by hitting a similar facility in Haifa and targeting two Israeli airbases. Many of the missiles were intercepted over the occupied West Bank.

No deaths were reported on either side.

Israel plays down tensions

The exchanges complicated Trump’s push to end a war that the US and Israel launched on February 28. A ceasefire announced on April 8 paused all-out warfare. But flare-ups in the Gulf have continued.

For his part, Netanyahu said in a televised statement that he had told Trump that “Israel has a full right to self-defence, and we are exercising it as required”.

“Right now, the fire at the front is contained, because after we hit the terrorist regime in Tehran, it stopped attacking us,” he said.

Netanyahu also warned that should Iran “make the mistake of resuming attacks against us, we will respond with full force”.

Israel’s ambassador to Washington, Yechiel Leiter, downplayed reports of tension between the US and Israeli leaders, telling Fox News that “sometimes, lovers have a spat”.

He said that while Netanyahu had “decided” to “lower the temperature” at Trump’s request, the US president understands “full well” that Israel cannot “absorb ballistic missiles into our country without responding.”

Iran’s Ministry of Foreign Affairs spokesperson, Esmaeil Baghaei, blamed Washington for the escalation.

“The US is directly responsible,” he said. “They are party to the ceasefire negotiations. Therefore, any act in violation of the ceasefire, be it through the interception of vessels [in the Strait of Hormuz], the targeting of southern Lebanon by Israel, or any other event, will cause the United States to be directly responsible for the escalation in the region.”

Iran’s First Vice President Mohammad Reza Aref said the operation against Israel, dubbed “Nasr” or victory, showcased “a new level of deterrence from mighty Iran” and that Israel had been “forced to beg once again” for a ceasefire.

Behind the scenes, diplomatic efforts continue.

Iranian President Masoud Pezeshkian posted on X that Tehran was still “at the negotiating table”, while Iran’s ambassador to the United Nations, Amir Saeid Iravani, said that Washington and Tehran, through Pakistan as an intermediary, are “presenting and exchanging views” towards an agreement.

Iravani told The Associated Press news agency he was hopeful that “very soon” the two sides would reach “a conclusion”.

Pakistan’s Prime Minister Shehbaz Sharif said efforts for a peaceful diplomatic solution was ongoing “earnestly and painstakingly” and called for restraint, “especially when the final objective is just about to be achieved”.

He also said Israel and Iran’s exchange of fire was a “reminder of the dangers associated with a tenuous ceasefire and the unbearable consequences it may lead to”.

Attacks on Lebanon continue

The escalation on Monday also drew in Yemen’s Houthi rebels.

The group fired missiles at Israel early in the morning and declared a complete ban on Israeli maritime navigation in the Red Sea, warning that all Israeli movements would be considered “legitimate military targets”.

Later on Monday, air raid sirens sounded in the Israeli port city of Eilat, with the military saying a suspected aerial target was launched from Yemen.

Violence has also continued in southern Lebanon.

An Israeli strike killed five people in the city of Tyre, while another, in the Nabatieh district, left seven dead. A third strike in Marwanieh killed two people, the Lebanese Ministry of Health said.

Phyllis Bennis, a fellow at the Institute for Policy Studies, said Trump was trying to give an impression that he was tougher on Israel than he actually is.

“The words could be significant if they were matched by actions,” she told Al Jazeera.

“As long as they’re sending billions of dollars directly to the Israeli military, and as long as they’re protecting Israel from being held accountable in the International Court of Justice or the International Criminal Court, as long as those actions don’t change, the words just don’t mean very much,” she added.