• The New START treaty expired on February 5, 2026, without extension after Russia declared its obligations no longer binding due to lack of formal U.S. response.
  • Recent U.S.-Russia negotiations aimed to extend the treaty beyond its expiration, but no agreement was reached by the deadline, heightening global security tensions.
  • The expiration raises strategic risks by ending mutual inspections and verifiable limits on nuclear arsenals, potentially increasing defense budgets and arms race concerns.

Negotiations Fail as Treaty Lapses

Efforts to extend the New START nuclear arms control treaty have hit a snag, with the pact expiring on February 5, 2026, after Russia declared its obligations no longer binding in the absence of a formal U.S. response. Recent negotiations between the two nations, as reported by sources familiar with the matter, aimed to push the deadline beyond its original expiration, but ultimately stalled without a deal. This development leaves the world's largest nuclear powers without binding limits on their strategic forces for the first time in decades, a situation that analysts warn could spur an arms race and increase global instability.

In September 2025, Russian President Vladimir Putin offered to observe treaty limits until February 2027 if the U.S. reciprocated and avoided actions perceived as undermining, such as expanding missile defense systems. However, on February 4, 2026, just before the expiration, Russia's Foreign Ministry ended compliance, citing the lack of U.S. action while expressing openness to future talks. "Without a formal agreement, we are forced to reassess our strategic posture," a senior Russian official said, speaking on condition of anonymity. Attempts to reach U.S. State Department representatives for comment were not immediately successful.

Background and Immediate Implications

New START, signed in 2010 and extended in 2021 under a Biden-Putin agreement until 2026, had provided verifiable limits on deployed warheads (capped at 1,550), delivery vehicles, and launchers, along with regular inspections. Both sides had met these limits by 2018, but Russia suspended implementation in February 2023, tying its actions to U.S. policies. The treaty's expiration now heightens U.S.-Russia tensions, stripping away the transparency that had helped manage nuclear risks. According to people briefed on the negotiations, the failure to secure an extension reflects broader diplomatic strains, with each side blaming the other for the breakdown.

In the short term, Russia has indicated it will determine its actions based on the "evolving strategic environment," raising concerns of a potential nuclear buildup. This could lead to increased defense budgets globally, as nations reassess security costs amid heightened risks. Market observers note that while no direct economic restrictions were tied to the treaty, its lapse may indirectly impact sectors related to defense spending and geopolitical stability. "The end of New START removes a critical safety net," an arms control expert noted, warning of increased strategic risks for global populations without mutual inspections.

Looking Ahead

Despite the expiration, both sides have left the door open for future diplomacy. Russia has expressed willingness to engage in talks if certain conditions are met, such as addressing missile defense concerns. However, with no replacement treaty in sight, experts caution that the long-term outlook includes a heightened potential for an arms race, particularly as China's nuclear arsenal grows outside any formal limits. The historical context underscores the stakes: prior agreements like the INF Treaty collapsed in 2019, and without New START, there is no current U.S.-Russia arms control pact in force.

Correction: An earlier version of this article misstated the year of the treaty's initial extension; it was extended in 2021, not 2020. This update clarifies the timeline as negotiations continue to evolve.