Turkish president Recep Tayyip Erdoğan is at odds with just about everybody. He is on opposite sides with Russia in Syria as well as Libya and is trying the patience of his US and European allies. Turkey and Russia are testing the limits of what was always at best an opportunistic, fragile partnership aimed at capitalizing on a seemingly diminishing US interest in the Middle East, already evident under President Barack Obama and continuing under Donald Trump, who is haphazardly redefining what he sees as America’s national interests.