The head of the CIA has travelled to Russia for unscheduled talks.
US intelligence chief John Ratcliffe flew to Moscow via Latvia, but neither the Trump administration nor Russia is publicly commenting.
Footage on social media also appears to show a diplomatic motorcade travelling through the Russian capital.
Retired Australian Major General Mick Ryan told Mike Hosking he believes Donald Trump is after Vladimir Putin's support to get out of the a very tight spot in Iran.
He says any help Russia may offer would be designed to leverage Trump's help in getting a favourable solution in Ukraine.
Ryan told Hosking that Russia's in big trouble in Ukraine, and it can only make significant process by using nuclear weapons, or by getting Trump back on side.
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