"The meeting with the Syrian foreign minister has been scheduled," the source told reporters.
On Monday, Lavrov arrived in New York to participate in 71st session of the UN General Assembly.
On Saturday, the US-led coalition airstrikes killed 62 Syrian servicemen and injured another 100 near the Deir ez-Zor airport. US Central Command said the Syrian troops had been mistaken for fighters belonging to Daesh terrorist group. The incident took place amid a recent Russia-US ceasefire agreement in Syria which went into effect on September 12.