President Donald Trump has ruled out deploying American troops, but is open to providing air support

Kiev's Western European backers have asked the US to deploy F-35 jets to Romania as "security guarantees" to help end the Ukraine conflict, The Times reported on Wednesday. In addition, they reportedly want Washington to supply Kiev with Patriot and NASAMS interceptor missiles, as well as "permission to fly spy planes over the Black Sea."

US President Donald Trump on Tuesday told Fox News that he had ruled out deploying American troops to Ukraine in the event of a peace deal with Russia but that air support was possible. "They are willing to put people on the ground. We're willing to help them with things, especially, probably... by air," he said.

Senior Western European and US military chiefs have since met in Washington to discuss the "logistics" of a security package, The Times wrote.

NATO already runs what the paper described as "policing missions" over the Black Sea from the Mihail Kogalniceanu airbase in Romania, its largest European airbase.

The facility was used by US forces during their invasion of Iraq and would most likely serve as a base for the F-35s, The Times wrote.

European NATO countries also reportedly want guarantees that they would have access to US satellite and intelligence data, according to the newspaper.

Moscow has previously warned that any airfields, in any country, will be legitimate targets if they host jets participating in combat missions against Russian troops involved in the Ukraine conflict.

Russia has also repeatedly warned that it will consider any NATO troops deployed in Ukraine as valid military targets - whether they are sent under the guise of "peacekeepers" or otherwise. Any such deployment risks a direct clash and "uncontrollable escalation" between Russia and the West, Moscow has said.