On this day, 72 years ago, August 14, 1953 (July 5, 1953 in the lunar calendar), the Soviet Union announced that it had a hydrogen bomb. On August 12, 1953, the former Soviet Union's hydrogen bomb test was successful. On August 14, 1953, Soviet Prime Minister Malinkov announced that the United States no longer monopolized the production of hydrogen bombs. Malinkov did not mention the details of the Soviet Union's success in building and testing hydrogen bombs, which he mentioned in a paragraph in a four-hour speech to the Supreme Soviet. U.S. political circles were shocked by Malinkov's announcement, but nuclear scientists said the Soviet Union's success was expected. The two countries have been competing to develop the most powerful weapon. Although the most subtle details of the two countries 'research are kept secret, some American scientists say the Soviet hydrogen bomb is the leader because the Soviet hydrogen bomb is small enough to be carried by aircraft, while the U.S. hydrogen bomb that exploded in Eniwetak last year is still too big to be used in actual combat.