U.S. senator John McCain gives a public lecture on the sidelines of the IISS Shangri-La Dialogue in Singapore June 3, 2016. REUTERS/Edgar Su

U.S. senator John McCain gives a public lecture on the sidelines of the IISS Shangri-La Dialogue in Singapore June 3, 2016. REUTERS/Edgar Su

U.S. senator John McCain gives a public lecture on the sidelines of the IISS Shangri-La Dialogue in Singapore June 3, 2016. REUTERS/Edgar Su

June 3, 2016 5:16 AM (UTC+8)