Recent military exercises in the Indian Ocean conducted by Eurasian powers have also been of interest to regional outsiders such as the United States, as they are a certain sign of the rising importance of these waters in the context of security, competition and control.
From the point of view of classical geopolitics, the Indian Ocean is significant element of the outer crescent of the World Island. It is adjoined to the inner crescent which represents rimland of Eurasia. From the days of the Cold War, this zone was under the control of the United States, with Navy and Air Force military bases extending from Persian Gulf to Diego Garcia.
During the unipolar moment from 1991 till 2010s, Washington still felt comfortable in its position; however, over the last few years, the situation has changed dramatically.