Smokescreen by Trump which MAy has fallen for hook, line and sinker.
Just as the Mueller investigation moves into its final phase turning up the heat on Trump (just witness the vitriol of his most recent tweetstorm about Comey) he has to try and demonstrate his independence from the influence of Putin and distance himself from any connection to Russia. He neede a distraction and what better way than to bomb something and keep everyone's eyes off the real story.
Trouble is, he is in it up to his sweaty neck & I am pretty sure Mueller has a grip on something substantial. Shame everyone has to be dragged into it with him.