US President Barack Obama

North Korea said Wednesday it is no longer necessary to negotiate with the US, threatening of retaliatory actions by conventional, nuclear and cyber-warfare attacks.
"Since the gangster-like US imperialists are blaring that they will 'bring down' the DPRK, oblivious of its poor plight facing adverse fate, the army and people of the DPRK cannot but officially notify the Obama administration of the US that the DPRK has neither need nor willingness to sit at negotiating table with the US any longer," North Korea's powerful National Defense Commission announced in a statement carried by the official Korean Central News Agency.
The DPRK is the acronym of the North's formal name, the Democratic People's Republic of Korea.
The country's top military body, headed by leader Kim Jong-un, also strongly denounced remarks by US President Barack Obama last month that the North is bound to collapse, calling it "the most isolated, the most sanctioned, the most cut-off nation on Earth." The commission warned that the US should know "the DPRK's smaller, precision and diversified nuclear striking means and ground, naval, underwater, air and cyber warfare means will be used." North has conducted three known underground nuclear tests in 2006, 2009 and 2013, prompting the UN to slap sanctions on Pyongyang in accordance with UN resolutions condemning its missile launches and nuclear tests. The six-party talks aimed at denuclearizing North Korea has been stalled since late 2008 when the North walked away from the negotiating table. The forum involves the two Koreas, the US, China, Russia and Japan.