Trump warned Syria, Russia, and Iran against attacking the last rebel stronghold in Syria.
He warned against "recklessly attacking" but Russia started airstrikes by the next morning.
Trump has ordered strikes on Syria in response to chemical weapons use in the past.
But Russia looks to have forecasted its use and made plans to fight back against a US strike.
The US can probably still attack Syria and Russia wouldn't do anything about it.
But Business Insider reports that any hope for Syria's civilians has long gone.