The US State Department has voiced concerns about a deal brokered by Russia and Turkey to reduce violence in Syria, saying it's sceptical of Iran's involvement as a guarantor of the accord and Damascus' track record on previous agreements.
"We continue to have concerns about the Astana (Kazakhstan) agreement, including the involvement of Iran as a so-called 'guarantor,'" the State Department said in a statement on Thursday.
"Iran's activities in Syria have only contributed to the violence, not stopped it."
Turkey, Iran and Russia have signed the agreement calling for the setting up of four "de-escalation zones" in northern, central and southern Syria.
