World leaders on Tuesday piled pressure on Tehran to stick to diplomacy to bring an end to the Middle East war, after a salvo of attacks in the region left a ceasefire crumbling.

Iran's powerful chief negotiator warned the United States against any further escalation in the Strait of Hormuz, after a spate of attacks risked reigniting the Middle East war.

U.S. President Donald Trump warned Iranian forces on Monday that they would be “blown off the face of the Earth” if they attempted to target U.S. ships in the Strait of Hormuz or Persian Gulf.

Iran had "no pre-planned programme" to attack oil facilities in the United Arab Emirates, Iranian state TV said Monday, after the UAE blamed the Islamic republic for a drone strike at an energy installation in Fujairah.

Authorities in the emirate said the strike injured three Indian nationals who were taken to hospital. The UAE meanwhile said it had been targeted by a fresh Iranian barrage which it described as a "dangerous escalation", amid a ceasefire in the Middle East war.

U.S. President Donald Trump said Iran had "taken some shots" but caused little harm in the Strait of Hormuz Monday, while urging South Korea to join the war after one of its vessels was hit.

The United States has destroyed six Iranian boats and shot down missiles and drones fired at U.S. Navy and commercial vessels by Tehran's forces, a top U.S. admiral said Monday.

More than 300 families have been evacuated after massive amounts of ash billowed from the Mayon volcano over the weekend due to the collapse of lava deposits from its slopes, officials said Monday.

There was no explosive eruption from Mayon, which has been erupting mildly on and off since January, but huge deposits of lava on its southwestern slope suddenly cascaded down in a pyroclastic flow — an avalanche of hot rocks, ash and gas — before nightfall on Saturday, said Teresito Bacolcol, director of the Philippine Institute of Volcanology and Seismology.

European leaders on Monday said that U.S. President Donald Trump's snap decision to pull thousands of U.S. troops out of Germany came as a surprise but is a fresh sign that Europe must take care of its own security.

The Pentagon announced last week that it would pull some 5,000 troops out of Germany, but Trump told reporters on Saturday that "we're going to cut way down. And we're cutting a lot further than 5,000."

A Russian missile attack on an east Ukrainian town killed four people and wounded 16, authorities said Monday.

The governor of Ukraine's eastern Kharkiv region, Oleg Synegubov, said the strike targeted the town of Merefa, adding: "The victims are men aged 50 and 63, and women aged 41 and 52."

U.S. President Donald Trump said Saturday he will review a new Iranian peace proposal, but cast doubt over its prospects as he left open the possibility of future attacks on Iran.

Negotiations between the two countries have been deadlocked since a ceasefire came into effect on April 8, with one round of peace talks to end the more than two-month war having failed in Pakistan.