Kim Jong Un
US Secretary of Defense James Mattis warns North Korea of 'massive military response'.
World War III would be 'devastating'.
'Talking is not the answer!'
Tell-tale traits not present this time around, experts say.
Experts said reports in NK media were lacking the state's usual boasts of power.
That plan looks... comprehensive.
His comments come as China's president tells Trump to watch his words.
Try getting this one out of your head.
To worry or not to worry?
A new symbol of the 'Rocket Power Nation'?