Even veiled by thick layers of diplomatic fog, the overlapping meetings in Sochi between US Secretary of State Mike Pompeo and President Putin and Foreign Minister Sergey Lavrov still offer tantalizing geopolitical nuggets.

Russian presidential aide Yury Ushakov did his best to smooth the utterly intractable, admitting there was "no breakthrough yet" during the talks but at least the US "demonstrated a constructive approach."

Putin told Pompeo that after his 90-minute phone call with Trump, initiated by the White House, and described by Ushakov as "very good," the Russian president "got the impression that the [US] president was inclined to re-establish Russian-American relations and contacts to resolve together the issues that are of mutual interest to us."