He isn’t choosing a side in a 257-sided civil war. He’s destroying WMD production facilities.
Chlorine production facilities?
You think Putin is going to let Trump takeover one of his last puppet stakes. Not without a fight he won’t.
That is the point. Destroying one facility is not enough. People like McCain and Graham and Macron want more. And our allies in the Middle East clearly want to entangle the US in Syria indefinitely.