FILE PHOTO: U.S. Air Force Lieutenant General Alexus Grynkewich during a hearing on Capitol Hill in Washington, D.C., U.S., June 24, 2025. REUTERS/Kevin Mohatt/File Photo

By Idrees Ali and Sabine Siebold

(Reuters) -NATO military leaders are expected to meet on Wednesday to discuss Ukraine and the way forward, U.S. and NATO officials said on Tuesday, as Washington and European capitals work out details of what security guarantees might look like for Kyiv.

Ukraine and its European allies have been buoyed by U.S. President Donald Trump's promise during a summit on Monday of security guarantees to help end the war, but many questions remain unanswered.

As military planners started work on options, Trump ruled out sending U.S. troops into Ukraine but suggested Washington could provide some type of air support.

U.S. Air Force General Alexus Grynkewich, who also oversees all NATO operations in Europe, will brief the chiefs of defense on results of the Alaska meeting between Trump and Russian President Vladimir Putin last week.

Admiral Giuseppe Cavo Dragone, chairman of NATO's military committee, said there would be a video conference on Wednesday.

"As diplomatic efforts to secure peace in #Ukraine progress, looking forward to (Grynkewich's) update on the current security environment," Dragone said on X.

Officials pointed out that the meeting was taking place during unique circumstances and expected topics such as the security guarantee to be discussed.

Reuters was first to report the meeting.

A U.S. official speaking on condition of anonymity said U.S. General Dan Caine, chairman of the Joint Chiefs of Staff, was expected to attend the meeting, but plans could change.

The Pentagon did not immediately respond to a request for comment.

The British government said what is known as the Coalition of the Willing, which met virtually on Tuesday, had agreed that their planning teams would meet with U.S. counterparts in the coming days to advance plans for security guarantees for Ukraine.

WHAT DOES U.S. SUPPORT LOOK LIKE?

Earlier on Tuesday, Trump ruled out placing American soldiers in Ukraine and gave no specifics about the security guarantees he has previously said Washington could offer Kyiv under any post-war settlement.

But in the same interview with Fox News, Trump suggested that Washington could provide air support to Ukraine.

"When it comes to security, (Europeans) are willing to put people on the ground, we're willing to help them with things, especially, probably, if you talk about by air because nobody has stuff we have, really they don’t have," Trump said. He did not provide any further details.

The White House said air support was an option being looked at.

"It is an option and a possibility. I won't certainly rule out anything as far as the military options that the president has at his disposal... I can tell you he's definitively ruled out boots on the ground," White House press secretary Karoline Leavitt told reporters later on Tuesday.

There are a wide variety of ways the U.S. could provide air support. It could be as simple as providing more air defense systems to Ukraine or a more involved U.S. role that includes U.S. fighter jets enforcing some sort of no fly zone.

Officials have told Reuters that the Pentagon is carrying out planning exercises on the type of support Washington could offer that goes beyond simply providing weapons.

Ukrainian President Volodymyr Zelenskiy said after his meeting with Trump and European leaders that security guarantees for Kyiv will likely be worked out within 10 days.

(Reporting by Idrees Ali and Sabine Siebold; Editing by Chizu Nomiyama, Rod Nickel, Mark Porter and David Gregorio)