TOKYO -- On Saturday, the U.S. Navy announced a surprise realignment of a strike group that includes the USS Carl Vinson nuclear-powered aircraft carrier. The sudden change in plan to move the fleet from the South China Sea to waters near the Korean Peninsula is seen aimed at putting pressure on North Korea, which has been engaging in a series of provocations with nuclear weapons and ballistic missiles. But Pyongyang's saber rattling is not the sole purpose of the shift.
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