President-elect Donald Trump's national security adviser and Russia's ambassador to the US have been in frequent contact in recent weeks, including on the day the Obama administration hit Moscow with sanctions in retaliation for election-related hacking.

After initially denying that Michael Flynn and Ambassador Sergey Kislyak spoke on December 29, a Trump official said yesterday that the transition team was aware of one call on the day President Barack Obama imposed sanctions.

It's not unusual for incoming administrations to have discussions with foreign governments before taking office.

But repeated contacts just as Obama imposed sanctions would raise questions about whether Trump's team discussed - or even helped shape - Russia's response.

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Russian President Vladimir Putin unexpectedly did not retaliate against the US for the move, a decision Trump quickly praised.

More broadly, Flynn's contact with the Russian ambassador suggests the incoming administration has already begun to lay the groundwork for a closer relationship with Moscow.

That effort appears to be moving ahead, even as many in Washington, including Republicans, have expressed outrage over intelligence officials' assessment that Putin launched a hacking operation aimed at meddling in the US election to benefit Trump.

In an interview published yesterday by the Wall Street Journal, Trump said he might do away with Obama's sanctions if Russia works with the US on battling terrorists and achieving other goals.

"If Russia is really helping us, why would anybody have sanctions?" he asked.

During a news conference on Wednesday, Trump highlighted his warmer rapport with the Russian leader.

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"If Putin likes Donald Trump, I consider that an asset, not a liability, because we have a horrible relationship with Russia," he said.

The sanctions targeted the GRU and FSB, leading Russian intelligence agencies that the US said were involved in the hacking of the Democratic National Committee and other groups.

The US also kicked out 35 Russian diplomats who it said were actually intelligence operatives.

Questions about Trump's friendly posture toward Russia have deepened since the election, as he has dismissed US intelligence agencies' assertions about Russia's role in the hacking of Democratic groups.

In briefing Trump on their findings, intelligence officials also presented the President-elect with unsubstantiated claims that Russia had amassed compromising personal and financial allegations about him, according to a separate US official.

The Senate Intelligence Committee announced late on Friday that it would investigate possible contacts between Russia and people associated with US political campaigns as part of a broader investigation into Moscow's meddling in last year's presidential election.

- AAP