( CNN ) -- NEW : U.S. says it `` stands vigilantly by '' U.S. . NEW : North Korea denies responsibility for hacking North Korean computers in Annual . U.S. will talk to Pyongyang , but Pyongyang has to talk giving up nukes , Kevin Bohn says . Ballistic missiles may be able to carry nukes , a U.S. defense intelligence assessment says .
NEW : U.S. says it `` stands vigilantly by '' U.S. . NEW : North Korea denies responsibility for hacking North Korean computers in Annual . U.S. will talk to Pyongyang , but Pyongyang has to talk giving up nukes , Kevin Bohn says . Ballistic missiles may be able to carry nukes , a U.S. defense intelligence assessment says .