re: Why did Trump warn Syria & Russia before attacking?

How much warning did he give? It's one thing to announce it a week in advance versus a couple of hours. Besides, he needed to warn the Russians who everyone knew would warn the Syrians. The point of the attack was to disable the delivery system of the chemical weapons, not to kill as many Syrians as possible. The Syrians and Soviets, shite I mean Russians, could clear out personnel but not the weapons with too short of a notice.