In this image from video provided by the US Navy, the guided-missile destroyer USS Porter (DDG 78) launches a Tomahawk land attack missile in the Mediterranean Sea on April 7.
In this image from video provided by the US Navy, the guided-missile destroyer USS Porter (DDG 78) launches a Tomahawk land attack missile in the Mediterranean Sea on April 7.

Friday's US cruise missile attack on a regime air base marked a new phase in the Syrian conflict. It was the first time in the war that the US has directly engaged with the Assad regime.

Here's a timeline of previous US action in Syria:

Source: TRT World