United Nations Secretary-General Antonio Guterres warned Tuesday against a new atomic arms race bringing the threat of “annihilation” to the world, as North Korea charged that its peninsula was on the brink of nuclear war. With nuclear-armed nations expanding and modernizing their arsenals, the UN chief called for a revitalized push to reduce and eventually eliminate those weapons. “A worrisome new arms race is brewing. The number of nuclear weapons could rise for the first time in decades,” Guterres told the General Assembly on the final day of its yearly session. “Any use of a nuclear weapon — anytime, anywhere and in any context — would unleash a humanitarian catastrophe of epic proportions,” he said. “Nuclear sabers are again being rattled. This is madness. We must reverse course,” he said. Russia and the United States have by far the largest arsenals, but China’s has been growing quickly. North Korea has also defied the world with its nuclear program and repeated missile tests. In its speech, one of the last of the week-long marathon of September’s UN General Assembly, North Korea accused arch-rival the United States of driving the peninsula “closer to the brink of nuclear war.” Kim Song, North Korea’s ambassador to the United Nations, denounced South Korea’s actions under President Yoon Suk Yeol, a conservative who has worked to build tighter cooperation with the United States as well as historic rival Japan. “Due to its sycophantic and humiliating policy of depending on outside forces,” Kim said, “the Korean peninsula is in a hair-trigger situation with imminent danger of nuclear war.” He pointed to the recent formation of the Nuclear Consultative Group, through which the United States hopes to integrate its nuclear capacity better with South Korea’s conventional forces, with the two allies increasing information sharing and contingency planning. Kim alleged that the group was “committed to the planning, operation and execution of preemptive nuclear strike against the DPRK,” the official name of the North, the Democratic People’s Republic of Korea. An envoy from South Korea, formally known as the Republic of Korea, took the floor to object to the remarks by North Korea, which routinely lashes out at the United Nations. “Do you believe, as the DPRK pretends, the Republic of Korea together with the United States conspires to provoke a nuclear war on the Korean Peninsula without reasons that will cause catastrophic casualties: he asked. Hours earlier South Korea staged its first military parade in a decade, with some 4,000 troops marching through a rainy Seoul. “If North Korea uses nuclear weapons, its regime will be brought to an end by an overwhelming response from the ROK-US alliance,” Yoon warned at an air base north of Seoul as he hailed the expansion of US ties. The Stockholm International Peace Research Institute reported in June that the world’s nuclear powers, and China in particular, increased investment in their arsenals for a third consecutive year in 2022. “The world has spent too long under the shadow of nuclear weapons. Let’s step back from the edge of disaster,” Guterres said.