On this day, 27 years ago, May 11, 1998 (April 16, 1998, the lunar calendar), India conducted three underground nuclear tests, which were opposed by countries around the world. On the afternoon of May 11, 1998, India successfully conducted three underground nuclear tests in the Birkland area of western Rajasthan. Twenty-four years ago, in May 1974, India conducted its first nuclear test in the region. According to media reports here, India's main opposition parties, the Congress Party and the United Front, expressed support for the government's decision to conduct the nuclear test. Indian strategic and security analysts believe that this is a concrete implementation of the government's nuclear option rights and is based on considerations of national security and interests. At 12:21 on May 13, India conducted two more underground nuclear tests in the Boklan Desert area of Rajasthan. This time, the test below the kiloton equivalent was carried out and was part of the Indian government's series of nuclear tests. The entire nuclear test plan has been completed. The Indian government said that the two nuclear tests, like the ones conducted on the 11th, were completely sealed underground nuclear explosions and did not leak radioactive materials into the atmosphere. After India's underground nuclear test, some international organizations and countries quickly responded and expressed regret. UN Secretary-General Kofi Annan issued a statement through his spokesperson's office expressing regret over India's nuclear test. Annan said in a statement that the Comprehensive Nuclear-Test-Ban Treaty adopted by the 50th UN General Assembly in 1996 requires all member states to fulfill their commitment not to conduct nuclear tests in order to promote comprehensive nuclear non-proliferation, promote the nuclear disarmament process, and thereby enhance peace and security. Annan pointed out that although India is not a signatory to the Comprehensive Nuclear-Test-Ban Treaty, its nuclear tests violate the spirit of relevant agreements reached by the international community. Annan called on all member states to exercise restraint in order to promote the process of nuclear disarmament. He also expressed his welcome and support for all measures to promote nuclear disarmament, stop nuclear testing and strengthen nuclear non-proliferation. The Vienna-based Comprehensive Nuclear-Test-Ban Treaty Organization said in a statement that India's nuclear testing is "a sad development" for the international community, which adopted the Comprehensive Nuclear-Test-Ban Treaty in 1996."There was" great hope "for banning nuclear testing. Pakistan Prime Minister Nawaz Sharif emphasized that "the Pakistani government is closely monitoring the resulting developments and will decide the necessary measures to be taken." Sharif said that the Pakistani government can assure its citizens that "Pakistan is fully capable of defending national security." To this end,"Pakistan reserves the right to take any necessary measures." Japan, Malaysia, the United States, Canada, Austria, Thailand, South Korea, Australia, Russia, Ukraine, Argentina, Bolivia, Brazil, Colombia and other countries have all issued statements expressing regret, frustration and disappointment.