"We have made up our minds. There will be no retreat from the principles of the revolution or surrender of a single inch of the Syrian south."
U.S. special forces are working with the Free Syrian Army to stage a Deir ez-Zor chlorine-based attack as a pretext for more airstrikes, the Russian military claimed Monday.
President Donald Trump called for Arab partners to contribute more to the fight against ISIS in Syria, but Saudi backing could further complicate the war.
An account affiliated with Turkey's so-called Operation Olive Branch claimed Kurdish fighters attacked the Free Syrian Army with chlorine gas.
As a Turkey-backed offensive neared Manbij, Syria, the head of U.S. Central Command said withdrawal was "not something we are looking into."
Neither Russian, Syrian nor U.S. forces have moved in to stop the Turkish invasion aimed at ousting Pentagon-backed Kurds from the enclave of Afrin.
One year after a vicious battle turned the tides of war for Syrian President Bashar al-Assad, he and his Russian ally want the U.S. gone.
The three countries all want a stake in Syria's future and appear willing to secure it by making long-term military commitments.
Turkey's control of the border raises tensions, as it's a bulwark against Syrian Kurds who America supports.
Washington has said that both sides should focus on fighting ISIS.
The militant group now controls at least 60 percent of the besieged Palestinian camp in Damascus.
When a rebel fighter who is a father of four is kidnapped by ISIS, the family flees to Germany.
Ayman, a five-year-old Syrian, was forced to leave for Jordan two-and-a-half years ago.
A convoy of 50 aid trucks will travel to the encircled Syrian town on Thursday.
But a senior Western diplomat who declined to be named was skeptical of Russia's assertions.
His statement appeared to be the first time Moscow said it was aiding Assad's opposition against ISIS.
A top Free Syrian Army commander describes how the Russians bolster Assad's forces.
The latest report from the U.N. comes four weeks after Russia began its airstrike campaign.