Russia and Iran warn US they will 'respond with force' if red lines crossed in Syria again: The alliance supporting Syriangovernment made a joint statement threatening action in response to “any breach of red lines from whoever it is”.
Trump officials tell Russia to drop its support for Syria’s Assad: Officials in the Trump administration on Sunday demanded that Russia stop supporting the Syrian government or face a further deterioration in its relations with the United States.
"We're calling (Russia and Iran) out," US Ambassador to the United Nations Nikki Haley said: "I don't think anything is off the table at this point. I think what you're going to see is strong leadership. You're going to continue to see the United States act when we need to act."