The United States has intensified its allegations against China, claiming that the country conducted a covert nuclear weapons test in 2020. Recent releases of seismic data and satellite imagery analysis are presented as evidence supporting these accusations. In response, China has vehemently denied the allegations, asserting that the U.S. is fabricating excuses to justify a return to its own nuclear testing. The escalation of these claims occurs amid rising geopolitical tensions and discussions about nuclear modernization by both nations. The U.S. government states it is prepared to match any Chinese low-yield nuclear tests, further heightening anxieties regarding an arms race.