Syria's President Bashar al-Assad says his government is receiving messages from the US-led coalition battling the jihadist group, Islamic State.
Mr Assad told the BBC that there had been no direct co-operation since air strikes began in Syria in September.
But third parties - among them Iraq - were conveying "information".
He also denied that Syrian government forces had been dropping barrel bombs indiscriminately on rebel-held areas, killing thousands of civilians.
Mr Assad dismissed the allegation as a "childish story", in a wide-ranging interview with BBC Middle East editor Jeremy Bowen in Damascus.
"We have bombs, missiles and bullets... There is [are] no barrel bombs, we don't have barrels."
Our correspondent says that his denial is highly controversial as the deaths of civilians in barrel bomb attacks are well-documented.