Lead
On Feb. 4, 2026, the New START treaty between the United States and Russia lapsed, leaving the two largest nuclear powers without legally binding limits on deployed arsenals for the first time in decades. The treaty had capped deployed strategic warheads and delivery systems since it entered into force in February 2011; its expiry has prompted urgent warnings from arms-control veterans and defense analysts about the risk of a renewed, rapid arms competition. Washington and Moscow have said they could still adhere informally to limits, but there is no immediate agreement to do so. The lapse has also intensified debate over whether future arms control must include China, which the Pentagon reported in 2022 could possess roughly 1,500 warheads by 2035 if current expansion continues.
Key takeaways
- New START expired on Feb. 4, 2026, removing legally binding caps that had limited each side to 1,550 deployed strategic warheads.
- The treaty had also constrained deployment to 700 strategic delivery systems (ICBMs, SLBMs and heavy bombers) and 800 deployed/non-deployed launchers.
- A 2022 Pentagon assessment estimated China could reach about 1,500 warheads by 2035 if current trends hold, a principal reason cited for seeking a trilateral framework.
- Some U.S. officials favor a short extension or informal adherence; others, including senior advisors, argue the limits are outdated without Chinese participation.
- Analysts warn that a lapse could prompt rapid ‘‘uploading’’ of warheads—especially by Russia, which reportedly has active production lines—raising risks of miscalculation and reduced transparency.
- Proposals at issue include a one-year extension, new trilateral talks with China, or unilateral force posture changes that could trigger reciprocal steps by Russia.
Background
The New START (Strategic Arms Reduction Treaty) entered into force in February 2011 as a successor to prior U.S.-Russian limits on strategic nuclear weapons. It established numerical ceilings: 1,550 deployed strategic warheads, 700 deployed strategic delivery systems and 800 deployed and non-deployed launchers. The goal was predictability and verification via mutual inspections and data exchanges after decades of bilateral arms-control efforts.
The agreement was set for 10 years and in 2021 Washington and Moscow agreed to a five-year extension, carrying the treaty through Feb. 4, 2026. That second extension was not structured for automatic renewal; the two governments could, however, choose to continue observing its limits by agreement. Over the last decade strategic dynamics have shifted: China has accelerated build-up of its forces, and political relations between the U.S. and Russia have become more adversarial, complicating diplomacy.
Main event
When the treaty expired on Feb. 4, 2026, both capitals issued statements emphasizing different priorities. Russian officials publicly signaled they no longer feel bound by treaty obligations in the current political environment. The Russian Foreign Ministry characterized unanswered proposals from Washington as ‘‘erroneous and regrettable’’ and said Moscow considers itself free to choose next steps.
U.S. officials reacted more ambivalently. A White House spokesperson and other administration aides repeated that the president seeks a broader form of arms control that would include China; senior U.S. figures also said the president will decide the way forward on his own schedule. In recent months some U.S. officials and advisers had publicly floated the idea of a trilateral framework—an approach Beijing has consistently rebuffed.
Arms-control experts, former negotiators and defense officials told reporters that letting New START lapse without an interim agreement risks rapid changes in force postures. Some predicted U.S. preparations could include administrative steps that would allow more warheads to be displayed on delivery systems again; other analysts warned Russia is better positioned to ‘‘upload’’ warheads quickly because of active production capacity for warheads and related components.
Analysis & implications
The treaty’s expiry narrows the diplomatic tools available to manage strategic stability between major powers. New START’s verification measures—inspections, notifications, data exchanges—helped limit uncertainty about force size and disposition; without those mechanisms, moves by either side become harder to interpret, increasing the chance of misperception. That loss of transparency raises tensions not only bilaterally but also among U.S. allies who rely on extended deterrence assurances.
One contested strategic question is whether continuing the New START limits temporarily would be the best near-term step. Proponents argue a short extension buys time to negotiate broader terms that include China and to prepare force posture adjustments. Opponents counter that limits negotiated when China’s force was smaller now disadvantage the United States relative to a tripolar environment, and that a new strategy should account for combined Russian and Chinese capabilities.
Economically and industrially, an unconstrained build-up would be costly for each nation. Reconstituting or accelerating production lines for warheads and delivery systems would require sustained investment, and some analysts say Russia presently has an edge in rapid production. A sustained three-way competition would also raise proliferation pressures among regional players uncertain about security guarantees, potentially spurring allied hedging or independent programs.
Comparison & data
| Measure | New START Limit | China (projection) |
|---|---|---|
| Deployed strategic warheads | 1,550 (each side) | ~1,500 by 2035 (Pentagon 2022 projection) |
| Deployed strategic delivery systems | 700 (ICBMs, SLBMs, heavy bombers) | Not covered by New START; China expanding delivery forces |
| Deployed & non-deployed launchers | 800 | Not applicable / no trilateral cap |
The table highlights core numerical ceilings established by New START and the Pentagon’s 2022 projection for China’s stockpile growth. Those totals illustrate why some U.S. policymakers argue a bilateral framework no longer reflects global realities, while others stress that losing agreed limits immediately will reduce predictability and increase strategic risk.
Reactions & quotes
“The worst case is it spirals and then some unforeseen or foreseeable incident touches off a conflict that escalates rapidly to a nuclear conflict.”
Thomas Countryman, former acting undersecretary of state for arms control
Countryman’s remark, echoed by other arms-control veterans, frames the primary operational anxiety: absent transparency, routine incidents or misinterpreted maneuvers could be magnified. He and similar voices argue that verification and notification mechanisms reduce the odds of rapid escalation.
“We do not benefit from a wasteful, inefficient arms race. We do not benefit from a lack of predictability and transparency in knowing what the Russian nuclear program is up to.”
Paul Dean, former assistant secretary of state for arms control
Dean emphasized the strategic value of predictability obtained through treaty measures. His view supports proposals for either a temporary extension or an interim arrangement to preserve inspection and data-sharing routines while broader diplomacy proceeds.
“China is a near-peer superpower or will be a nuclear superpower, and so now we need a strategy to deter nuclear war with Russia and China.”
Matthew Kroenig, Atlantic Council
Kroenig argues the United States must rethink numerical ceilings to account for China’s growing force. That perspective underpins calls for a new, possibly trilateral, approach to arms control—an idea Beijing has repeatedly declined to accept so far.
Unconfirmed
- No official U.S.-Russia agreement to continue observing New START limits beyond Feb. 4, 2026 has been published; reports of quiet adherence are not independently verified.
- Claims that Russia can immediately field a specific number of additional deployed warheads are contingent on classified inventories and production rates and have not been publicly corroborated.
- Public reporting that China will definitely reach 1,500 warheads by 2035 is a projection based on current trends and assumptions, not an assured outcome.
Bottom line
The lapse of New START removes the last formal bilateral constraints on U.S. and Russian strategic arsenals and reduces the formal transparency that helped manage strategic risk for more than a decade. Policymakers face a clear choice: negotiate an interim arrangement or extension to preserve verification, seek a more ambitious multilateral framework that includes China, or accept a period of unconstrained competition with higher risks of miscalculation.
Each path carries trade-offs. A short-term extension would buy diplomatic breathing room and preserve inspection routines. Pursuing new limits that meaningfully include China would be strategically comprehensive but politically difficult and time-consuming. Abandoning limits altogether risks a costly arms competition, greater insecurity among allies, and a more volatile global strategic environment.
Sources
- CNN (news report) — original public reporting on treaty expiry and expert comments.
- U.S. Department of State (official) — background on New START treaty limits and verification provisions.
- U.S. Department of Defense (official) — 2022 assessments referenced regarding China’s projected force growth.
- Center for Strategic and International Studies (CSIS) (think tank) — analysts on allied perspectives and deterrence.
- Arms Control Association (NGO) — commentary on arms control implications.
- Atlantic Council (think tank) — strategic posture and policy recommendations.