The US and Russia made "progress" in discussions Saturday designed to avoid accidents between them in the increasingly crowded air space over war-torn Syria, the Pentagon and Moscow said, and more talks are planned.

Washington expressed alarm this week after Moscow failed to quickly answer proposals made during previous talks, even as Russia launched cruise missiles from the Caspian Sea and repeatedly violated Turkish air space.

"The discussions were professional and focused narrowly on the implementation of specific safety procedures," Pentagon spokesman Peter Cook said in a statement after the 90-minute video conference.

"Progress was made during the talks and the US agreed to another discussion with Russia in the near future."

Cook disclosed few details, except to say that the discussions took place between US defense officials and their counterparts in Moscow and focused on "steps that can be taken" by Russian and US-led coalition aircraft "to promote safe flight operations over Syria."

The Russian defense ministry in a statement described the talks as "professional and constructive", confirming that more talks were planned in future.

"Progress has been made towards a possible accord between the two countries' defence ministries with regard to the security of the airspace that is being used... to strike international terrorists in Syria," the ministry said.

US officials were furious after Russia only gave them a vague, verbal "heads-up" about an hour before Moscow launched its bombing campaign over Syria on September 30.

The two countries held "deconfliction" talks the next day via video conference, aimed at ensuring Russian warplanes didn't cross paths with drones and US-led coalition jets targeting Daesh extremist group in Syria.

Russian planes have flown near a US drone, officials say, and the US military has had to reroute some flights to avoid any close calls.
Source: AFP