Deputy Prime Minister Richard Marles has refused to rule out the possibility of fuel rationing if current petrol and diesel shortages worsen.

Speaking to the ABC, Marles said the government was releasing extra fuel to boost current stocks.

"Right now, we have taken steps to put more fuel supply into the system. Over the course of the weekend, we released 20 per cent of the stock holdings that are kept in Australia," he said.

"We've also loosened the restrictions, or the regulations around sulphur levels, which in turn releases about 100 million litres into the system as well per month.

When pressed about the introduction of fuel rationing, Marles refused to rule it out.

"Obviously, this is a function of how long this conflict continues, and that's not something that I can answer in terms of what's going to happen," he said.

First it was Venezuela, then he put an eye on Greenland before turning to Iran - and now Trump appears to have identified the next world leader he wants ousted.

The New York Times is reporting that the Trump administration is pushing to remove Cuban President Miguel Diaz-Canel from power.

American negotiators have reportedly told their Cuban counterparts that the president "must go", but would leave the final decision with them.

People inside the White House believe that toppling Cuba's president would allow "structural economic changes in the country" that a hard-liner such as Diaz-Canel was unlikely to support.

Despite having plenty on his plate already, Trump insiders say this move would give him a "symbolic win that would allow him to tell the American public that he had brought down the leader of a leftist government long opposed to the United States".

Israel is expanding its ground operations in Lebanon to deter Hezbollah attacks against northern Israel.

The military's chief of staff, Lieutenant-General Eyal Zamir, said overnight the army is "determined to deepen the operation until all of our objectives are achieved".

Speaking on a visit to the northern border of Israel, Zamir said: "We are preparing for what comes next and reinforcing the Northern Command with additional troops in order to strengthen the forward defensive posture, deepen the damage to Hezbollah, and push the threat away from the communities in the north."

Israeli strikes in Lebanon against Hezbollah have displaced more than one million people, the Lebanese Disaster Risk Management Unit said.

At least 886 people have been killed in Lebanon and more than 2100 have been wounded, it said.

Israeli Defence Minister Israel Katz said "hundreds of thousands" of residents of southern Lebanon who have been evacuated or are evacuating "will not return to areas south of the Litani (river) until the safety of residents (of northern Israel) is assured."

The two Iranian women's football players who remain in Australia have trained with the Brisbane Roar club.

Brisbane Roar chief executive Kaz Patafta said Fatemeh Pasandideh and Atefeh Ramezanisadeh were being supported by the team as they plan their new lives in Australia.

"Today, Brisbane Roar officially welcomed both players to the club's training facilities to take part in training with our A-League Women squad and we remain committed to providing a supportive environment for them whilst they navigate the next stages," Patafta said.

Seven members of the Iranian national women's side initially sought asylum, but five have since changed their minds and returned to Iran.

Trump says he's put back his visit to China, scheduled to begin in late March, by a "month or so" because of the war.

"I want to be here," Trump said at the White House. "I have to be here, I feel."

A trip by Trump to China to hold talks with President Xi Jinping has been scheduled for the end of March and early April.

"I think it's important that I be here. And so it could be that we delay it a little bit," Trump said.

US Vice President JD Vance has just been asked by a reporter in the White House if he is "fully on board" with the Iran war.

Vance, who has been tapped by Trump to lead a task force combatting benefits fraud, has previously criticised open-ended US military deployments.

US media outlets have reported that Vance had cautioned Trump against striking Iran.

But Vance, standing alongside Trump, says he trusts the president "to get the job done", and deflected the question by turning on the journalist.

"You're trying to drive a wedge between members of the administration, between me and the president," he said.

"What the president said consistently going back to 2015, and I agreed with him, is that Iran should not have a nuclear weapon."

A drop in oil prices on Monday (Tuesday AEDT) helped send the US stock market to its best day since the war in Iran began.

The S&P 500 climbed 1 per cent for its biggest gain in five weeks. The Dow Jones Industrial Average added 387 points, or 0.8 per cent, and the Nasdaq composite jumped 1.2 per cent.

The driver for markets once again was the price of oil.

Brent crude, the international standard, fell 2.8 per cent to US$100.21 per barrel after earlier getting as high as US$106.50.

Australian shares are set to continue their recovery today.

ASX 200 futures were up 66 points or 0.8 per cent to 8646 near 7am AEDT, reports the Australian Financial Review.

Governments should consider introducing free public transport to wean commuters off their cars and help redistribute fuel supplies to rural areas.

The Victorian Farmers Federation president Brett Hosking told Today this morning it would be one way of freeing diesel and petrol stocks from urban areas and helping farmers.

"We've completely empty in places like Wedderburn, places like Bonny Doon. It's affecting Victoria.

"We need to get the fuel out of our metropolitan areas, into those rural communities where it's needed to grow your food and fibre."