Washington is willing to discuss promising not to deploy ground-launched missiles or combat forces in Ukraine if Russia agrees to do the same, according to confidential documents that the Spanish newspaper El Pais said were Washington's and NATO's written replies to Russian security demands.
El Pais did not say how it obtained the documents.
"The United States is willing to discuss conditions-based reciprocal transparency measures and reciprocal commitments by both the United States and Russia to refrain from deploying offensive ground-launched missile systems and permanent forces with a combat mission in the territory of Ukraine," the U.S. document said, according to a copy on the El Pais website.
NATO and the Kremlin told Reuters they would not comment.
The positions set out in the two documents, which were officially handed to Moscow on Jan. 26, are consistent with public statements by Washington and its allies in the past, particularly in terms of offering military transparency.
In its written reply, the United States offered transparency over its Romanian and Polish missile sites if Moscow did the same at two sites in Russia.
In the NATO document, the 30-member alliance said: "the reversal of Russia's military build-up in and around Ukraine will be essential for substantive progress."