Japan destroyer leaves port reportedly to escort US warships

Japan's helicopter carrier Izumo departs Yokosuka port on Monday, May 1, 2017, amid rising tension following missiles tests by North Korea. Japan's navy has dispatched its largest destroyer reportedly tasked with escorting U.S. military ships off the Japanese coast amid heightened tension on the Korean Peninsula. (Ren Onuma/Kyodo News via AP) (The Associated Press)

Japan's helicopter carrier Izumo sails in the waters off the Boso Peninsula, east of Tokyo, as it starts to escort a U.S. supply ship after departing Yokosuka port, south of Tokyo, Monday, May 1, 2017. Japan's navy has dispatched its largest destroyer reportedly tasked with escorting U.S. military ships off the Japanese coast, a first-time mission under new security legislation that allows Japan’s military a greater role overseas, amid heightened tension on the Korean Peninsula. (Ren Onuma/Kyodo News via AP) (The Associated Press)

A U.S. supply ship sails in the waters off the Boso Peninsula, east of Tokyo, as it is escorted by Japanese destroyer Izumo Monday, May 1, 2017. Japanese media said the U.S. supply ship is expected to refuel other American warships, including the USS Carl Vinson carrier strike group, amid heightened tension on the Korean Peninsula. (Ren Onuma/Kyodo News via AP) (The Associated Press)

Japan's navy has dispatched its largest destroyer reportedly tasked with escorting U.S. military ships off the Japanese coast amid heightened tension on the Korean Peninsula.

The helicopter carrier Izumo departed the Yokosuka port near Tokyo earlier Monday.

Japanese media say the destroyer is set to escort a U.S. supply ship in the Pacific Ocean south of Tokyo later Monday, a new mission under the new security legislation allowing Japan's military a greater role in overseas activity. The U.S. supply ship is expected to refuel other American warships, including the USS Carl Vinson strike group, currently in the region.

Japan's defense ministry only says the Izumo left to eventually participate in an international naval event in Singapore on May 15.