North Korean leader Kim Jong-un boasts of removal of 'filth' after execution of uncle He continued: "It is necessary to establish stringent revolutionary discipline and order in all domains of the revolutionary struggle and construction work." Kim Jong-un during an inspection of the second battalion under Korth Korean army Unit 1973 Photo: AFP With celebrations of Christmas officially outlawed, New Year festivities and speeches play an important role in Pyongyang politics. The 26-minute speech was aired four times on January 1, at regular intervals, and punctuated by regular resounding applause - despite there being no visible audience. An analysis of the audio by BBC Monitoring suggested that the same clip of applause is used several times throughout the broadcast. The 30-year-old 'Dear Leader" also called for "a decisive turn" in agricultural output and vowed to rebuild the crumbling economy - with priority on infrastructure, agriculture and energy. North Korea has suffered chronic food and energy shortages under the ruling Kim dynasty. Despite a rise in staple food output in recent years, daily life for millions is an ongoing struggle with under-nutrition. But in a perhaps unexpected flourish, Mr Kim appeared to call for cooperation with South Korea. He said it was "high time" for the two Koreas to stop doing "anything detrimental to national unity and reconciliation." "We will join hands with anyone who opts to give priority to the nation and wishes for its reunification, regardless of his or her past, and continue to strive for better inter-Korean relations," he said. Mr Kim, however, said North Korea would not beg for peace. He accused the United States and South Korea of manoeuvring for a nuclear war against the nuclear-armed North and vowed to strengthen its military power. If war breaks out again in this land, it will bring about a massive nuclear disaster and the US will also never be safe. We are faced with a dangerous situation in which a small, accidental military clash can lead to all-out war. Yang Moo-jin, a professor at Seoul's University of North Korean Studies, said the speech underlined Mr Kim's desire to portray himself as an unchallenged and stable leader, two years after he took power. "He is sending a message to its people that, with Jang gone, now let's put the purge behind and look to the future - based on firm unity among the party, military and the government," he said.