North Korea warns U.S. and South Korea will ‘pay dearly’ for joint military exercise
 · 4dStars and Stripes
North Korea won’t ‘sit still’ while US carrier visits South, Kim’s sister says
US aircraft carrier visits South Korea in show of force against North Korea

North Korea unveils nuclear-powered submarine for 1st time

 · 19hAgence France-Presse on MSN
North Korea's Kim inspects 'nuclear-powered submarine' project
North Korea Threatens US With Nuclear Response
North Korea unveils nuclear-powered submarine for the first time
The Week3d
Irked by US nuclear-powered aircraft carrier's port call to Busan, North Korea hints at nuclear escalation
North Korea's Kim Yo Jong warns the US of nuclear escalation after USS Carl Vinson's Busan visit, calling it a hostile provocation justifying DPRK’s nuclear buildup
North Korea's Kim Yo Jong accuses Trump administration of stepping up provocations
North Korea's Kim Yo Jong, the powerful sister of leader Kim Jong Un, criticised the Trump administration for stepping up "provocations" and said it justified the nuclear state increasing its nuclear deterrent,
South Korea and the US will begin annual military drills next week
South Korean and U.S. troops will begin their large annual joint military drills next week to enhance their readiness against North Korean threats.