In this Nov. 12, 2017 photo provided by South Korea Defense Ministry, three U.S. aircraft carriers USS Nimitz, left top, USS Ronald Reagan, left center, and USS Theodore Roosevelt, left bottom, participate with other U.S. and South Korean navy ships during the joint naval exercises between the United States and South Korea in waters off South Korea's eastern coast in South Korea. The United States and South Korea on Saturday started joint naval exercises that will involve three U.S. aircraft carriers in what military officials describe as a clear warning to North Korea. (South Korea Defense Ministry via AP)
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