Yeah, not a regime change move, or a cripple the Syrian military move, but a move designed to show assad that trump isn't going to tolerate the use of chemical weapons and a signal to Russia that trump doesn't care if they've allied themselves to assad, if assad crosses the line he will use military force against him.
All in all, a shot across the bow, a warning to everyone that he's not playing around.
I think also a sign to China that he will probably do the same regarding North Korea for if, probably when, they cross the line.