South Korea 's accuses Pyongyang president of slander . President Barack Obama voices concerns over South Korea 's nuclear program . South Korea 's launches two mid-range missiles . U.N. condemns the move , will consider 'appropriate response '
North Korea accuses South Korea 's president of slander . President Park voices concerns over North Korea 's nuclear program . Pyongyang launches two mid-range missiles . U.N. condemns the move , will consider 'appropriate response '