US probing: Did Russia take part in chem weapons attack?

The United States is looking into whether Russia participated in the Syrian chemical weapons attack that provoked President Donald Trump's airstrikes against the Assad government, a revelation that could have dramatic implications for relations between Washington and Moscow.On Friday, senior U.S. military officials said a drone belonging to either Russia or Syria was seen hovering over the site of the chemical weapons attack after the assault earlier this week. Russia is one of Syria's most impo