Countries need to unite to help bring peace to war-torn Syria - in a future which cannot include President Bashar al-Assad, Michael Fallon has said.
Speaking to ITV News, the Defence Secretary confirmed that the UK knew about a US airstrike on a Syrian airfield - launched in response to a chemical weapons attack on civilians - ahead of time.
He said he hoped it would serve as a call for other nations to "work harder" to find a solution, including the removal of Assad's regime.
I hope we will all now redouble our efforts to bring about a political settlement in Syria.
This is a civil war which has gone on for five years now, it has cost hundreds of thousands of lives, millions of people have been displaced.
We all now need to work harder to bring about a political settlement in Syria, a future for Syria, without a dictator who's prepared to gas his own people.
Asked whether he was concerned about an escalation in tensions with Russia as a result, he went on to say that Putin had had "every opportunity" to help bring the conflict in Syria to an end.
"On the contrary, what [Russia] has been doing, is prolonging this civil war," he said.
"I think, now, Russia needs to think again about the influence it exercises over the dictator."
Boris Johnson looks "daft" and is in "deep political trouble" after pulling out of a meeting with the Russians, Alex Salmond has said.
The defence secretary condemned Vladimir Putin's Kremlin for its role in Bashar Assad's suspected chemical weapons attack on his own people.
The leading critic of the Trump administration has told ITV News the US and its allies must build on the president's justified airstrikes.