After a three-and-a-half-year marriage of convenience, Turkey and Russia have come to realize that they are fighting on opposite sides of two proxy wars: one in Syria and the other in Libya. This comes after Russia sold Turkey $2.5 billion worth of S-400 air defense systems, won a multibillion-dollar nuclear plant contract, signed up for a lucrative natural gas pipeline, and widened the gap between NATO and its part-time member Turkey.