North Korea's response to the joint exercise between America and South Korea: simulating a nuclear war against us! In response to the joint military exercise between the US and South Korea, North Korea called this exercise a simulation of a nuclear war against Pyongyang and emphasized that it would strengthen its nuclear deterrent. A deputy of the Central Committee of the Workers' Party of Korea described the so-called "Iron Mace exercise" as "the most hateful exercise of nuclear war with the aim of using nuclear weapons against the Democratic People's Republic of Korea."