I have written about this dilemma many times before, and as my first posts below from last year show, I was one of the first people to warn about these attacks before they even occurred (it didn't take a genius to see them coming).
First, the US and Israel both attacked Syrian forces inside Syria, a complete and fragrant violation of international law.
Now, according to CBS, a Pentagon official is saying that the US strike not only killed 100 Syrian soldiers, but that it killed Russian troops as well.
Remember this when the US harps on about what a threat Russia is, or North Korea, or Iran. There is no other country in the world doing what the US is doing right across the geopolitical chessboard.
For sources and more information, please see:
http://theantimedia.org/world-brink-war-syria/
https://www.cbsnews.com/news/forces-hit-by-u-s-in-syria-included-russian-mercenaries-official-says/