WASHINGTON: Outgoing CIA director John Brennan has warned US President-elect Donald Trump to avoid off-the-cuff remarks once he takes office. He said spontaneity was not in the interests of national security.

Trump is known for regularly making broad pronouncements on issues of national importance on his Twitter feed. Brennan also said that Trump did not fully appreciate Russia's capabilities or intentions.

"I think Mr Trump has to understand that absolving Russia of various actions that it's taken in the past number of years is a road that he, I think, needs to be very, very careful about moving down," he said.

Brennan's remarks, in an interview for Fox News Sunday, come a week after the release of a US intelligence report which said Russian President Vladimir Putin had likely attempted to influence the election.

Trump is considered to have underplayed for months the conclusions of the intelligence community that Moscow hacked Democratic candidate Hillary Clinton's campaign. He only accepted them at a news conference on Wednesday.

Meanwhile both the Kremlin and Trump's team have denied reports in the Sunday Times newspaper that the two sides were planning a summit between Trump and Putin in the Icelandic capital Reykjavik.

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