Russia says it has had no involvement in the travel plans of fugitive US intelligence leaker Edward Snowden.
The exact whereabouts of Mr Snowden, who flew to Moscow from Hong Kong on Sunday, are unclear.
Foreign Minister Sergei Lavrov insisted he had not crossed the Russian border.
He criticised what he termed US attempts to blame Russia for his disappearance, saying they were "groundless and unacceptable".
Correspondents say Mr Lavrov's comments suggest that Mr Snowden remained airside after landing at Moscow's Sheremetyevo airport, and so has technically never entered Russian territory.