Iran's Revolutionary Guards warned on Tuesday that they would respond firmly to any ships that diverge from the Islamic republic's approved route through the Strait of Hormuz.

Hours after the UAE's top oil executive said the country had "emerged stronger" from war and as thousands attended an Abu Dhabi summit to boost the local economy, phones across the country were alerting that missiles were incoming.

The first attacks since a truce came into effect last month were a stark reminder of its fragility, dampening hopes of a quick return to normality, with Iran imposing a new reality: should the United States or Israel strike, the UAE would be the one to pay.

Israel's military chief Lieutenant General Eyal Zamir said on Tuesday that the army was prepared to respond "with force" to any attack by Iran.

Iranian Foreign Minister Abbas Araghchi will travel to Beijing on Tuesday for talks, the foreign ministry said, amid stalled negotiations with the United States to end the Middle East war.

"During the visit, he will meet his Chinese counterpart (Wang Yi) to discuss bilateral ties and regional and international developments," the ministry said in a brief statement.

The United Arab Emirates said Tuesday its air defenses were engaging missiles and drones coming from Iran for the second consecutive day, weeks into a fragile ceasefire in the Middle East war.

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.

Two people were injured when a residential building was targeted in Oman's Bukha along the coastline of the Strait of Hormuz, state media reported on Monday.