North Korean leader Kim Jong-un instructed the communist country to bolster its nuclear arsenal and war preparations in a special essay to mark an upcoming national anniversary, according to the country's state-controlled media Tuesday.

The Rodong Sinmun, the mouthpiece daily for the ruling Workers' Party of Korea, carried the piece in honor of the 70th anniversary of the party's founding on Oct. 10. The headline read "The Laborious Work of Kim Jong-un: The feat of the party of great comrades Kim Il-sung and Kim Jong-il is victory and invincibility."

North Korea "should produce more powerful cutting-edge arms of our kind and tirelessly strengthen self-defense nuclear deterrence while rigorously making war-fighting preparations involving the entire population," it said.

The defense power is the dignity and the sovereignty of North Korea as well as a guarantee for victory, Kim stressed.

The thesis also highlighted the importance of firming up internal unity and socialism, calling for a "thorough consolidation of the monolithic leadership."

The reunification of two Koreas is yet the biggest task for the party, Kim said, stressing it should be achieved without any interference from foreign countries. (Yonhap)