Han Min-koo says Seoul will never acknowledge a nuclear North Korea.
The op-ed also urged voters not to vote for 'dull' Hillary.
Ri Su-yong, a former foreign minister and Workers' Party vice chairman, is in China on a three-day visit.
Seoul officials say rocket was likely a Musudan intermediate-range missile.
Kim Jung-Un's Facebook clone is called Best Korea's Social Network.
Ko Yong-suk and husband Ri Gang defected to the US in 1998 and assumed new identities.
Activists are dropping SD cards and USB sticks containing Western and South Korean films into North Korea.
South Korea Air Force website hit by hackers and site has been down for two weeks.
North Korean diplomat says Trump's offer was 'propaganda' for his presidential campaign.
The presidential candidate slammed Trump over his recent comments on the UK and North Korea.
The former prisoner has described the horrific punishments dished out in the hermit nation's prisons.
Pyongyang requests high-level military summit with Seoul to ease tensions in Korean Peninsula.
'I would speak to him. I would have no problem speaking to him,' said Trump.
North Korea's new foreign minister is a veteran diplomat with decades of experience in international policies.
Don't expect any privacy there either says State Department.
BAE Systems claims that malware used in Sony Pictures hack is similar to that used in recent banking heists.
Thousands of North Koreans joined dance and torchlight parade at end of ruling-party congress.
Hanjin Heavy Industries of South Korea was hacked in April.
Evidence links hacker groups from North Korea, Pakistan and a third unknown location to the heist.
Hundreds of thousands celebrated the end of the first Workers' Party Congress to be held here in 36 years.
Over 100 foreign journalists were allowed into Pyongyang for the first Workers' Party Congress in 36 years.
Hayes accused of 'distorting' facts and 'speaking' ill of the leadership.