US Secretary of State John Kerry may visit Russia soon as Washington and Moscow are trying to mend their strained ties.

Russian Foreign Minister Sergei Lavrov also told reporters on Saturday that US National Security Adviser Tom Donilon also plans to visit Moscow, "probably this month", according to the RIA Novosti.

Analysts said the visits may give the US and Russia a chance to ease tensions that have flared up in recent months by disagreements over a series of issues including Syria.