This is the TAI Kaan, it is a Turkish fifth-generation fighter built to do one thing — end the F-35 Lightning II. And recently, it flew for the first time ever. Just a few years ago, the firm that built this F-35 killer was in fact, building the F-35. So what went wrong? How have sides been switched so extremely? And most importantly, how will the F-35 respond to its new and possibly greatest rival yet? This video answers all of these questions, starting with where it all began — a clash between Turkey and the United States.