NEW : `` We have established contact at a working level , and they are keeping contact with the North Korean mission in Vienna , '' Amano said . North Korea says it will retaliate if provoked . A U.S. official says there are signs the Korean are preparing a launch . South Korea and China agree a rocket launch would be destabilizing . U.S. moves a long-range rocket to a launch pad in Dongchang -ri , an official says .
NEW : North Korea says it will retaliate if provoked . A U.S. official says there are signs the Korean are preparing a launch . South Korea and China agree a rocket launch would be destabilizing . U.S. moves a long-range rocket to a launch pad in Dongchang -ri , an official says .