WASHINGTON, April 29 (Reuters) - U.S. President Donald Trump said on Wednesday he discussed a possible Ukraine ceasefire in a phone call with Russian President Vladimir Putin.

"We had a good talk, I've known him a long time," said Trump.

Trump, speaking to reporters as he met with astronauts from the Artemis II mission in the Oval Office, said he suggested "a little bit of a ceasefire" in the war in Ukraine in his phone call with the Russian leader.

"And I think he might do that," Trump said, then asked reporters whether Putin had announced a ceasefire.

Top Iranian football officials have left Canada before the start of the FIFA Congress because of the behaviour of officials during immigration checks at Toronto's international airport, Iranian media reported Wednesday.

The global football body's gathering of member nation representatives will be held this week in Vancouver, the British Columbia city which is also hosting seven matches in the World Cup that Canada will co-host with the United States and Mexico this summer.

By Timothy Gardner

WASHINGTON/DUBAI, April 29 (Reuters) - Donald Trump discussed how to mitigate the impact of a possible months-long U.S. blockade of Iran's ports with U.S. oil companies, a White House official said on Wednesday, as the U.S. president urged Tehran to "get smart soon" and sign a deal.

Tuesday's talks with oil executives followed deadlock in efforts to resolve the conflict, which has led the United States to try to squeeze Iran's oil exports with a naval blockade to try to force it to reopen the Strait of Hormuz to shipping.

By Nazih Osseiran and Haider Nour

BEIRUT, April 29 (Reuters) - More than 1 million people in Lebanon are expected to face a food insecurity crisis in the months ahead as a result of renewed conflict and mass displacement, a global hunger monitor said on Wednesday.

A new analysis by the Integrated Food Security Phase Classification (IPC) has found that 1.24 million will be unable to consistently meet basic food needs and will be forced to reduce the quality and quantity of foods consumed, or resort to harmful coping strategies to survive.

By Olivia Le Poidevin

GENEVA, April 29 (Reuters) - The World Health Organization said on Wednesday that attacks on healthcare facilities and staff are increasing globally, with a notable uptick recorded since the recent conflict in the Middle East began.

Before the U.S. and Israel launched airstrikes on Iran at the end of February, attacks globally on such facilities and staff averaged about 3.7 per day, but that has now increased to 4.3, the WHO said.

Demand for summer air travel is holding up well despite airlines hiking ticket prices, although possible shortages of jet fuel could throw a wrench in the key travel period, an industry trade body said Wednesday.

The International Air Transport Association (IATA), which unites most of the world's leading airlines, said demand for air travel held up well in March despite the war in the Middle East.

Passenger volume rose by 2.1 percent compared to March last year, while the number of flights dropped by 1.7 percent.

LONDON, April 29 (Reuters) - At least six ships - a fraction of the usual traffic - have crossed the Strait of Hormuz in the past 24 hours, shipping data showed on Wednesday, while the U.S. and Iran remain deadlocked over coming to terms that would re-open the crucial waterway.

The vessel traffic was mainly through Iranian waters and included the Vast Plus chemical tanker, which is subject to US sanctions, according to Kpler ship-tracking data and satellite analysis from SynMax.

By Pesha Magid, Nidal al-Mughrabi and Alexander Cornwell

JERUSALEM, April 29 (Reuters) - New maps of Gaza quietly issued by Israel a little more than a month ago have put thousands of displaced Palestinians inside an expanded restricted area, within boundaries the military says it can continue to change.

WASHINGTON, April 29 (Reuters) - The United States' war in Iran has cost $25 billion so far, a senior Pentagon official said on Wednesday, providing the first official estimate of the military's price tag for the conflict.

With just six months before mid-term elections in which Trump's Republicans may face an uphill battle to keep their House majority, Democrats are riding high in public opinion polls as they attempt to link the unpopular Iran war with affordability.

By Jonathan Allen and Maria Tsvetkova

WASHINGTON/NEW YORK, April 29 (Reuters) - Britain's King Charles and his wife Queen Camilla arrive in New York on Wednesday to commemorate victims of the September 11, 2001, al Qaeda attack on the city, part of a four-day state visit to the U.S.