A South Korean think tank said Pyongyang has already secured a technology to miniaturise nuclear warheads.
Pyongyang has conducted two nuclear tests in 2016 alone following those in 2006, 2009 and 2013.
During his final press conference as UN chief, Ban Ki-moon had hinted he might consider running for South Korea's presidency.
The Pyongyang foreign ministry said the US and its allies will be responsible for the 'ensuing consequences'.
Kim ordered special food for the soldiers "so that they would not envy a Chinese person".
The submarine is said to be capable of testing missiles larger than North Korea's KN-11 SLBM tested in August.
The high-profile defector says he became 'disenchanted' with Kim Jong Un regime.
There were also reports of anti-Kim Jong-un graffiti and leaflets in some provinces.
US sanctions imposed in March forbid any company to do business with North Korea.
North Korean leader appeared confused the following morning and blamed the generals for the fiasco.
The mock-up targets of North Korean forces include South Korean presidential palace Cheong Wa Dae.
PM Hwang Kyo-ahn said national security was the priority and restated that the military should be on high alert.
Pyongyang media says state hackers would never expose their IP addresses.
Regime is however still struggling to target larger ballistic missiles.
No area is free of corruption, but some countries are worse than others.
Ri Sol-ju was not mentioned in any reports carried by state-run media in the last 9 months.
The individual lists are in addition to UN sanctions and include blacklisting high-profile Pyongyang officials.
China will be the key player in enforcing the new sanctions targeted at coal exports.
Eruption in 946CE released more climate forcing gasses than any other volcano in last 2,000 years.
The world leaders who have said they will or will not attend the 4 December funeral.
UN Security Council permanent members to meet on 28 November and finalise draft resolution on sanctions.
Pyongyang to 'hoist flags at half-mast at major organisations and designated places'.