In this undated photo released by the Korea Central News...

In this undated photo released by the Korea Central News Agency, North Korean leader Kim Jong Un shoots to check the quality of the sporting bullets at the Meari Shooting Gallery in Pyongyang. Credit: AP

North Korea says its new leader, Kim Jong Un, has ordered troops to launch a powerful retaliatory strike against South Korea if provoked.

The official Korean Central News Agency reported Sunday that Kim issued the order during a visit to front-line military units, including one that shelled South Korea's Yeonpyeong Island in 2010, killing four people.

South Korean and U.S. troops are to kick off annual computer-simulated war games Monday. North Korea has threatened a "sacred war" over the drills.

A senior U.S. envoy said Saturday that ties between the two Koreas need to improve before North Korea and the United States can achieve real progress in their relationship.

Glyn Davies made the comments in Seoul after nuclear talks in Beijing with North Korean officials.

From celebrating America's 250th birthday to a new ride at Adventureland, NewsdayTV's Elisa DiStefano and Newsday lifestyle editor Meghan Giannotta have your inside look at Newsday's summer FunBook. Credit: Newsday/Howard Schnapp, Kendall Rodriguez, Drew Singh; Anthony Florio, Randee Daddona, Morgan Campbell, Debbie Egan-Chin

Get ready for sun and fun with NewsdayTV's summer FunBook special! From celebrating America's 250th birthday to a new ride at Adventureland, NewsdayTV's Elisa DiStefano and Newsday lifestyle editor Meghan Giannotta have your inside look at Newsday's summer FunBook.

From celebrating America's 250th birthday to a new ride at Adventureland, NewsdayTV's Elisa DiStefano and Newsday lifestyle editor Meghan Giannotta have your inside look at Newsday's summer FunBook. Credit: Newsday/Howard Schnapp, Kendall Rodriguez, Drew Singh; Anthony Florio, Randee Daddona, Morgan Campbell, Debbie Egan-Chin

Get ready for sun and fun with NewsdayTV's summer FunBook special! From celebrating America's 250th birthday to a new ride at Adventureland, NewsdayTV's Elisa DiStefano and Newsday lifestyle editor Meghan Giannotta have your inside look at Newsday's summer FunBook.

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