Description:North Korean leader Kim Jong-un on Tuesday (January 29) urged low-ranking party officials to work for national unity to help the country become powerful. Kim spoke at the closing ceremony of the 4th Meeting of Secretaries of Cells of the Worker’s Party of Korea (WPK). "Our successful satellite rocket launch last year was a historical achievement which showed off our strong national power. Also it was a great upheaval which hammered the enemies who were trying to crush us with vicious scheming,(1:05)