Syria (BBN)-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",reports BBC.
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.
'NO DIALOGUE'
Many US-led coalition states have denied co-operating with Mr Assad, whom they have urged to step down since an uprising against his rule erupted in 2011.
But the Islamic State's (IS) seizure of large parts of Syria and Iraq in the past year and its creation of a "caliphate" has prompted officials to consider working with the Syrian leader to combat the group.
Despite this, Mr Assad ruled out joining the international coalition that is seeking to "degrade and destroy" IS.
Jordanian air force F-16 takes off to strike Islamic State positions in the Syrian city of Raqqa (5 February 2015) The Jordanian air force has stepped up strikes on IS positions in Syria since the killing of one of its pilots
"No, definitely we cannot and we don't have the will and we don't want, for one simple reason - because we cannot be in an alliance with countries which support terrorism," he said.
He did not give details, but the Syrian government routinely portrays both jihadist militants and members of the political opposition as "terrorists".
Mr Assad stressed that he was not against co-operating over IS with other countries. But he would refuse to talk with American officials, he said, "because they don't talk to anyone, unless he's a puppet", an apparent reference to Western- and Gulf Arab-backed opposition leaders.
"And they easily trample over international law, which is about our sovereignty now, so they don't talk to us, we don't talk to them."
Jaish al-Islam fighter training in eastern Damascus (12 January 2015) President Assad dismissed efforts by the US to train and equip a "moderate" rebel force to fight IS militants
The president did concede, however, that his government had been receiving information indirectly via third parties about sorties by US and Arab warplanes over Syria.
"Sometimes, they convey a message, a general message, but there's nothing tactical," he said, adding: "There is no dialogue. There's, let's say, information, but not dialogue."
Mr Assad dismissed efforts by the US to train and equip a "moderate" rebel force to fight IS militants on the ground in Syria, saying it was a "pipe-dream". He argued that there were no moderates, only extremists from IS and al-Qaeda's affiliate in Syria, al-Nusra Front.
'NO INDISCRIMINATE WEAPONS'
Elaborating on his denial of the use of barrel bombs, Mr Assad said: "I know about the army. They use bullets, missiles and bombs. I haven't heard of the army using barrels, or maybe, cooking pots."
He added: "There are no indiscriminate weapons. When you shoot you aim, and you aim at terrorists in order to protect civilians... You cannot have war without casualties."
Aftermath of alleged shelling by Syrian government forces in Damascus suburb of Douma (9 February 2015) Mr Assad said Syrian government forces would not indiscriminately bomb civilian areas
Barrel bombs are large cylindrical metal containers filled with explosive and shrapnel.
Human rights activists say they are typically dropped from helicopters - which only government forces are believed to operate - at high altitudes to avoid anti-aircraft fire. At that distance, it is impossible to target with precision, they add.
Mr Assad similarly denied that government forces had used chlorine as a weapon, despite investigators from the Organisation for the Prohibition of Chemical Weapons supporting claims that at least 13 people had been killed in a series of attacks by helicopters on three villages last year.
The president also defended the besieging of rebel-held areas across Syria, which activists say has had the effect of starving civilian residents.
"In most of the areas where the rebels take over, the civilians fled and come to our areas," he said. "So in most of the areas that we encircle and attack, are only filled with militants."
BBN/SK/AD-10Feb15-2:10pm (BST)