The Russian Prime Minister says relations between Moscow and Washington have been "completely ruined" by the US airstrike on a government airbase in Syria.

Donald Trump ordered the missile offensive after a gas attack that is widely blamed on the Syrian president's regime.

The Kremlin supports him and Russian Prime Minister Dmitry Medvedev thinks his country and America are on the verge of a "military clash".

U.S. Secretary of State Rex Tillerson insists the action was only designed to make the airbase unusable: