The Russian military in Syria is now very active

Will the USA go to war in Syria AGAINST RUSSIA in order to defend ISIS?

This is a loaded complicated question.


No More Games: Russia Vows to Track and Target Any US Aircraft 'West of the Euphrates'

Moscow sends a crystal-clear message to Washington: The games in Syria are over
By Russia Insider

We didn't believe it at first, but it's true: Russia's Defense Ministry says it will target any aircraft from the US-led coalition flying west of the Euphrates.
In the areas of combat missions of Russian air fleet in Syrian skies, any airborne objects, including aircraft and unmanned vehicles of the [US-led] international coalition, located to the west of the Euphrates River, will be tracked by Russian ground and air defense forces as air targets,” the Russian Ministry of Defense stated.
The announcement comes after the US shot down a Syrian jet near Raqqa. Washington says the Syrian jet had dropped bombs near US-backed forces, but Damascus insists the plane was downed while flying a mission against Islamic State militants.
URGENT: Russian military halts Syria sky incident prevention interactions with US as of June 19 – Moscow https://on.rt.com/8f9g pic.twitter.com/w27zQsyy5y
Coalition’s airborne objects in Russian Air Force’s Syria missions areas to be tracked as targets – Moscow https://on.rt.com/8f9g  pic.twitter.com/PHqYQjI6Yo

View image on Twitter
This basically means that Russia is now taking complete control of most of Syria's airspace:

Russia says it will now "paint" any unauthorized aircraft flying west of the Euphrates River
Moscow has also cut its military communication line with the US in Syria. 
We hope Washington gets the memo this time. Because it doesn't sound like Russia is bluffing. Planes will be "painted". And is the US prepared to risk it?