The Caucasus is the point where Russia, Iran and Turkey meet. For most of the 19th century, the three powers dueled for dominance of the region. This dispute froze during the Soviet period but is certainly in motion again. With none of these primary powers directly controlling the region, there are secondary competitions involving Armenia, Azerbaijan and Georgia, both among these secondary powers and between the secondary powers and the major powers. And given that the region involves the Russians, Iranians and Turks, it is inevitable that the global power would have an interest as well — hence, Hillary Clinton’s visit.