U.S. President Donald Trump and Russia's President Vladimir Putin talk during the family photo session at the APEC Summit in Danang, Vietnam November 11, 2017. REUTERS/Jorge Silva

MOSCOW (Reuters) - The Kremlin said on Wednesday that U.S. allegations it was involved in a new generation of warfare, including internal political subversion, against the United States, were groundless and not backed by facts.

White House national security adviser H.R. McMaster made the allegations on Tuesday.