US Secretary of State John Kerry said on Friday that he would meet his Russian counterpart in the coming days to discuss an American proposal for closer military cooperation and intelligence sharing on Syria.
The proposal, which Kerry hopes to conclude within weeks, envisions ways in which Washington and Moscow would share intelligence to coordinate air strikes against the al Qaeda-affiliated Nusra Front and prohibit the Syrian air force from attacking moderate rebel groups.
The proposal has met with deep skepticism by top American military and intelligence officials.
"We're not entering into a transaction that is founded on trust," Marine General and Chairman of the Joint Chiefs of Staff Joseph Dunford said at a news conference with US Defense Secretary Ash Carter.