Ankara and Washington are locked in a game of chicken. With Turkey refusing to budge over its purchase of the NATO-incompatible S-400 missile defense system from Russia, the U.S. is upping the stakes with the threat of sanctions and ejection from the lucrative F-35 fighter jet program. The implications of this could be far reaching not just for Turkey and the U.S., but could shift the geopolitical balance in far-reaching ways.