New Delhi, Feb. 23 -- North Korean leader Kim Jong Un was reelected to the top post of the ruling Workers' Party, with delegates crediting him for bolstering the country's nuclear arsenal and strengthening its regional standing, state media reported Monday.

The report from the party congress, a major propaganda spectacle where Kim is expected to outline his political and military goals for the next five years, suggests he will double down on accelerating a nuclear arsenal already equipped with missiles capable of threatening Asian U.S. allies and the American mainland.

The party also released a new roster for its powerful Central Committee that confirmed a generational shift in Kim's leadership circle, with aging military chiefs and the...