Russia and Iran have warned the US they will "respond with force" if their own "red lines" are crossed in Syria. Following Friday's cruise missile strike on a Syrian air base, in retaliation for the chemical attack on Khan Sheikhoun earlier in the week, the alliance supporting Syrian President Bashar al-Assad made a joint statement threatening action in response to "any breach of red lines from whoever it is". "What America waged in an aggression on Syria is a crossing of red lines. From now on we will respond with force to any aggressor or any breach of red lines from whoever it is and America knows our ability to ... (full story)