How Russian warplanes in Libya could open  a new phase in the Middle East's biggest proxy war

The deployment, which the Pentagon revealed this week and Moscow denied, is the latest in a series of escalations that have seen all types of weapons — Turkish and Emirati drones, Russian anti-aircraft systems, Jordanian-made armored vehicles — enter Libya's Mad Max-like battlefields, in often-blatant disregard of a nine-year-old arms embargo