Ukrainian service members ride a tank, as Russia's attack on Ukraine continues, in Donbas region, Ukraine April 8, 2023. REUTERS/Yan Dorbronosov

By Gram Slattery, John O'Donnell and Jonathan Landay

WASHINGTON/FRANKFURT (Reuters) -Russia reiterated its previous terms for reaching a peace deal with Ukraine in a private communique sent to the U.S. over the weekend known as a "non-paper," according to two U.S. officials and a person familiar with the situation.

The communique reiterated Russia's demand that it take control of all of Ukraine's Donbas region, one of the U.S. officials said, a stance that effectively rejected Trump's view that the frontlines should be frozen at their prevailing locations.

Russia also reiterated its previous stance that no NATO troops be deployed to Ukraine as part of any peace agreement, one of the officials said.

News of the non-paper - diplomatic speak for an informal document meant to communicate one party's position to another - comes as a proposed summit between U.S. President Donald Trump and Russian President Vladimir Putin in Budapest appears increasingly in doubt.

A White House official told Reuters on Tuesday that there were no plans for that meeting "in the immediate future." The Russian embassy in Washington did not respond to a request for comment.

The communique also underlined the degree to which Russia has stuck to maximalist demands on Ukraine.

Asked for comment on the non-paper, the White House pointed to Trump's comments to reporters on Tuesday afternoon, during which he said he had not made a determination about the summit, but that he did not want to have a "wasted meeting." He added that he thought a ceasefire along the current battle lines was still possible.

Trump had a phone call with Putin on Thursday, after which he said the Budapest meeting would take place, possibly within the next two weeks.

At a private meeting with Ukrainian President Volodymyr Zelenskiy on Friday, Reuters and other media outlets reported that U.S. officials pitched the Ukrainian leader on a Kremlin-proposed plan to give up the Donbas region in return for small parts of the Zaporizhzhia and Kherson regions. Zelenskiy pushed back, and Trump thereafter said publicly the prevailing frontlines should be frozen.

(Reporting by Gram Slattery and Jonathan Landay and John O'Donnell in Frankfurt; Editing by Don Durfee, Deepa Babington and Jamie Freed)