After the ISIS War, a US-Russia Collision?

The American Conservative:

Sunday, a Navy F-18 Hornet shot down a Syrian air force jet, an act of war against a nation with which Congress has never declared or authorized a war.

Washington says the Syrian plane was bombing U.S.-backed rebels. Damascus says its plane was attacking ISIS.

Vladimir Putin’s defense ministry was direct and blunt:

“Repeated combat actions by U.S. aviation under the cover of counterterrorism against lawful armed forces of a country that is a member of the U.N. are a massive violation of international law and de facto a military aggression against the Syrian Arab Republic.”

An ABC report appears to back up Moscow’s claims:

Cont....