The United States has accused China of carrying out a secret nuclear test in 2020, as the Trump administration calls for a comprehensive arms control agreement that would encompass both China and Russia. This allegation arises just a day after the expiration of the last remaining nuclear arms control agreement between the US and Russia, which means that the largest nuclear powers in the world are no longer bound by any limits on their arsenals for the first time in decades. This context highlights the escalating concerns regarding global nuclear proliferation amidst shifting geopolitical dynamics.

President Donald Trump and several senior officials from his administration have made it clear that they will no longer adhere to the restrictions set by the New START treaty, insisting on the need for a new agreement to address the perceived threats from both Moscow and Beijing. Trump's administration has also advocated for the resumption of American nuclear weapon tests as part of a robust defense strategy. This signals a significant shift in US nuclear policy and potentially exacerbates tensions in already precarious international relations.

The implication of these developments may extend far beyond the US-China relationship, as it could lead to an arms race involving multiple nations and increased instability in global security. The situation underscores the urgency for diplomatic efforts in nuclear disarmament and arms control, particularly in light of the deteriorating security architecture that has historically aimed to limit nuclear proliferation. Understanding these dynamics is critical as nations navigate the complexities of nuclear capabilities and international treaties.