Just days before the United States is expected to inaugurate a new president, North Korean leader Kim Jong Un called Washington his “biggest, main enemy” and said that the country will keep developing its “long-range nuclear strike capability” to deter any threats to sovereignty.

State media reported on Saturday that the North Korean leader and thousands of other delegates convened for day four of the country’s politically-important Eighth Party Congress, where officials issued a “historic report” on the country’s future goals.