A TV screen shows an image of North Korean leader Kim Jong Un during a news program at the Seoul Railway Station in Seoul, South Korea, Tuesday, March 28, 2023. North Korea on Tuesday claimed it again detonated mock warheads during tests of nuclear-capable missiles and a purported underwater attack drone this week as leader Kim Jong Un called for his nuclear scientists to ramp up production of weapons-grade material to support a rapid expansion of delivery means. (AP Photo/Ahn Young-joon)