A significant international arms control agreement has expired, leaving the world’s two largest nuclear arsenals without formal constraints for the first time in decades. This development has sparked a sharp diplomatic exchange, with one global power accusing another of a rapid and opaque military buildup.
The expiration of the New START treaty earlier this month has created a strategic vacuum. A senior official from one nation told a disarmament conference that the lapsed pact was “seriously flawed,” arguing it failed to address what he described as an “unprecedented, deliberate, rapid and opaque nuclear weapons buildup” by a rival state. He asserted that this rival is expanding its arsenal “without constraint” and lacks transparency regarding its ultimate intentions.
The official further claimed intelligence indicates the rival power conducted a low-yield underground nuclear test in mid-2020 and is preparing for tests with larger yields. He presented seismic data from a neighboring country to support the allegation of the earlier explosion.
In response, a diplomat from the accused nation firmly rejected the claims, calling them “groundless” and a distortion of his country’s defense policy. He insisted his government “will not engage in any nuclear arms race” and emphasized that its nuclear stockpile is not comparable in size to those of the nations possessing the largest arsenals. He dismissed calls for his country to join trilateral arms talks as “not fair, reasonable or realistic.”
Despite the public acrimony, diplomatic channels appear to remain open. Sources indicate that preliminary discussions were held in one capital the day after the treaty lapsed, with more substantive talks scheduled in a neutral European city.
The expired treaty had limited the two primary signatories to 1,550 deployed strategic nuclear warheads each—a limit one party is now accused of exceeding. Officials from the accusing nation argue their rival is on a trajectory to possess the fissile material required for over a thousand warheads by the end of the decade, rapidly approaching that former cap.
With the landmark treaty now void, the official stated the goal is to negotiate a “better agreement toward a world with fewer nuclear weapons.” However, the absence of any active pact to curtail the planet’s most destructive weapons has heightened global concerns about the potential for a renewed and destabilizing arms competition.
