The expiration of the New START nuclear treaty marks the end of over fifty years of arms control between the U.S. and Russia, raising alarms about the possibility of a new nuclear arms race. Leaders and experts warn that for the first time in decades, there are no formal limitations on nuclear arsenals, a situation that may lead to increased global tensions. While Russia has expressed regret over the termination of the treaty, officials assert they are no longer bound by the previous nuclear limits. As the world enters this uncharted territory, the UN chief has described the moment as grave, urging both nations to engage in dialogue to prevent a resurgence of nuclear competition. Amid this uncertainty, geopolitical dynamics involving other powers, including China, are also being scrutinized.