The discussion is said to have been raised at Wednesday's summit between the US and European leaders, which was held ahead of Friday's meeting between Trump and the Russian President Vladimir Putin, according to the sources.
A European diplomat, a British official and another person with insight into what was said during the meeting tell Politico that the US is ready to contribute to guarantees that will deter Russia from future aggression against Ukraine.
Trump has realized that some form of security guarantee from the US is necessary to reach an agreement, according to the British source.
Trump, however, rules out that the defense alliance NATO will be involved and contribute to such a commitment, writes Politico with reference to the source who was informed about the conversation. Trump is also said not to have specified what he means by security guarantees, but instead talked about the concept in broader terms.
The White House has not commented on the information.
