US : Confusion over intel 's release . U.S. says it ` ` stands vigilantly by '' South Korea . NEW : North Korea claims responsibility for hacking South Korean computers in March . " will talk to North Korea , but it has to talk giving up " , Kerry says . Ballistic missiles may be able to launch nukes , a U.S. defense intelligence assessment says .
US : U.S. says it ` ` stands vigilantly by '' South Korea . NEW : North Korea claims responsibility for hacking South Korean computers in March . " will talk to North Korea , but it has to talk giving up " , Kerry says . Ballistic missiles may be able to launch nukes , a U.S. defense intelligence assessment says .