Saudi Arabia's King Salman is planning to visit Moscow in mid-March, Russia's RIA news agency reported on Wednesday, citing Kremlin aide Yuri Ushakov.
Ushakov said an agenda for the visit had not yet been decided.
Saudi Arabia, which is a member of the US-led coalition, and Russia disagree over how the Syrian civil war should be resolved.
The US-led coalition have consistently called on Assad to step down and back Syrian opposition groups while Russia and Iran, which is the archenemy of the kingdom, have supported the regime since the beginning of the conflict.
Saudi Arabia said last week it was ready to participate in any ground operations in Syria if the US-led coalition decided to start such operations.
Before the reports on Saudi visit in Moscow, the kingdom’s staunch Gulf allies, King of Bahrain and Qatar’s Emir, have also recently paid visits to the Russian Federation, holding meetings with President Vladimir Putin, who is the main supporter of the Syrian regime leader Bashar Assad.
Syrian regime forces and its allies backed by heavy Russian air strikes have reportedly been making significant gains in Aleppo's northern countryside, cutting opposition supply lines to Turkey and leading tens of thousands of Syrians to flee to the Turkish border north of Aleppo since Thursday.