Russian and Iranian forces last night warned Donald Trump they would retaliate with military action if he launched more airstrikes on Syria.
In an ominous threat raising the prospect of war, they said the US President had crossed a 'red line' with his surprise missile bombardment on Bashar al-Assad's forces.
'From now on we will respond with force to any breach of red lines and America knows our ability to respond well,' the military chiefs said in a joint statement with Hezbollah.
The Russian Embassy in London last night suggested there could be 'real war' if Moscow is presented with an ultimatum over Syria. But Boris Johnson will today lead a push for Russia to face tough new sanctions unless it withdraws its support for Assad.
It comes after President Trump ordered airstrikes on a Syrian airbase in the first direct attack by the US against Assad on Friday morning.