DUBAI, United Arab Emirates (AP) — President Donald Trump openly mused about seizing Iran’s Kharg Island oil terminal in the Persian Gulf and the United States and Israel kept up their attacks Monday on the Islamic Republic, even as there were signs of progress in nascent ceasefire talks. Tehran, meanwhile, struck a key water and electrical plant in hard-hit Kuwait, part of its ongoing campaign targeting the Gulf Arab states.

As a diplomatic effort being facilitated by Pakistan toward ending the war moved ahead, Trump said Iran had agreed to allow 20 oil tankers through the Strait of Hormuz starting Monday as “a sign of respect.” At the same time, with 2,500 U.S. Marines now in the region and a similar sized contingent on its way, he raised the idea of taking Iran's Kharg Island.

“Maybe we take Kharg Island, maybe we don't,” he told the Financial Times in an interview published early Monday. “We have a lot of options.”

Iran launches attacks on Israel and hits more infrastructure targets in Gulf states

Sirens sounded at dawn near Israel's main nuclear research center, a part of the country that has been targeted repeatedly in recent days. Israel's military also said it had taken out two drones launched from Yemen, where the Iranian-backed Houthi rebels entered the war on Saturday with its first missile attack.

Iran kept up the pressure on its Gulf Arab neighbors, as Saudi Arabia intercepted five missiles targeting its oil-rich Eastern Province, Bahrain sounded a missile alert, and a fireball erupted over Dubai as an incoming missile was taken out by defenses.

In Kuwait, an Iranian attack hit a power and desalination plant, killing one worker and injuring 10 soldiers, the state-run KUNA news agency reported.

Desalination plants remain crucial to water supplies in the Gulf Arab states, and an Iranian attack previously damaged a desalination plant in Bahrain during the war. The facilities are typically paired with power plants, because of the large amount of energy required to remove salt from the water to make it drinkable.

Israel’s military launched a new wave of attacks on Iran, saying it was striking “military infrastructure” across Tehran. Iranian media also reported that one of the facilities of Tabriz Petrochemical was struck in a northern province of the country. They said no hazardous materials had been released.

In Lebanon, which Israel has invaded by ground, an Indonesian peacekeeper was killed and three others wounded when a projectile exploded near a village in the south.

Over the weekend, Israeli Prime Minister Benjamin Netanyahu said the military will widen its invasion, expanding the “existing security strip” in that country’s south as it targets the Iran-linked Hezbollah militia.

Oil prices rise again as concerns of global energy crisis grow

Iran's attacks on the energy infrastructure of the region and its stranglehold on the Strait of Hormuz, through which a fifth of the world's oil is shipped in peacetime, has sent oil prices skyrocketing and given rise to growing concerns about a global energy crisis.

In early trading, the spot price of Brent crude oil, the international standard, was around $115, up nearly 60% from when the U.S. and Israel started the war with attacks on Iran on Feb. 28.

As pressure has grown on Trump to bring an end to the conflict, the U.S. has presented Iran a 15-point plan that includes it agreeing to open the Strait of Hormuz to shipping. Iran, meantime, has produced a five-point plan with its own terms, including maintaining its sovereignty over the key waterway.

Pakistan announced Sunday that it would soon host talks between the U.S. and Iran, though there was no immediate word from Washington or Tehran, and it was unclear whether discussions on the monthlong war would be direct or indirect.

Pakistan’s Foreign Minister Ishaq Dar the talks would be held "in the coming days.”

Trump says diplomatic approach going well but suggests military expansion is possible

Trump told reporters aboard Air Force One late Sunday that the U.S. was negotiating “directly and indirectly” with Iran, though Iran has insisted that it has not been in any talks with Washington.

"We’re doing extremely well in that negotiation but you never know with Iran because we negotiate with them and then we always have to blow them up,” Trump said.

Earlier, Iran’s parliament speaker, Mohammad Bagher Qalibaf, dismissed the talks in Pakistan as a cover after more U.S. troops to get to the area. He said Iranian forces were “waiting for the arrival of American troops on the ground to set them on fire and punish their regional partners forever,” according to state media.

In the interview with the Financial Times, Trump suggested it could mean a longer-term commitment if the U.S. decided to try and take Kharg Island, saying “it would mean we had to be there for a while.”

“I don’t think they have any defense," he added. "We could take it very easily.”

The U.S. already launched airstrikes once that targeted military positions on the island. Iran has threatened to launch its own ground invasion of Gulf Arab countries and mine the Persian Gulf if U.S. troops land on its territory.

To get an amphibious invasion force to Kharg would mean transiting the Strait of Hormuz and most of the Persian Gulf. Experts say that holding the island would also be a challenge, because in addition to its missiles and drones, it would be well within artillery range from the Iranian mainland.

Death toll climbs

In Lebanon, officials said more than 1,200 people have been killed and more than 1 million have been displaced. Five Israeli soldiers have also lost their lives.

In Iran, authorities say more than 1,900 people have been killed, while 19 have been reported dead in Israel.

In Iraq, where Iranian-supported militia groups have entered the conflict, 80 members of the security forces have died.

In Gulf states, 20 people have been killed. Four have been killed in the occupied West Bank.

Thirteen U.S. service members have been killed in the war.

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Rising reported from Bangkok. Associated Press writers Darlene Superville aboard Air Force One, Giovanna Dell'Orto in Miami, Florida and Munir Ahmed in Islamabad contributed to this story.