North Korean leader Kim Jong Un taunted the U.S. in his New Year’s Day address to the nation Monday, saying newly perfected nuclear capabilities mean he can launch a nuclear strike at any time. “The entire mainland of the U.S. is within the range of our nuclear weapons and the nuclear button is always on the desk of my office. They should accurately be aware that this is not a threat but a reality,” Kim said in his address broadcast on state TV. He said the U.S. would “not dare” to take any military action against Pyongyang because “they know that now we possess such great nuclear power.”