Russian officials have threatened to shoot down any US planes flying over Syria, west of the Euphrates River.
The confrontational remarks began after the United States shot down a Syrian Jet, an act which Russia proclaims is a provocation of war. Syria denounced the attack suggesting the United States is defending ISIS!
Russia is required, by treaty, to repell aggressors violating Syrian airspace. America is the aggressor in Syria. American warplanes are perpetrating war crimes in Syrian airspace, violating International Law