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‘Grave moment’: end of US-Russia nuclear pact comes at worst possible time, UN chief warns

Volodymyr Zelenskyy

Alexander Lukashenko

William Burns

Dmitry Peskov

Fiona Hill

Sergei Markov

Oleksiy Reznikov

James Stavridis

Dmitry Medvedev

Barry Posen

James Acton

Kevin Ryan

Nicolo Fasola

Matthew Bunn

Steven Pifer

Harry Kazianis

Mikhail Kasyanov

Robert Gates

Mitt Romney

Alexey Zaitsev

Pat Buchanan

Nina Khrushcheva

William Alberque

Fabian Hoffmann

Stephen I. Schwartz

Olga Oliker

Ira Helfand

"I think it's extremely unlikely that he [Putin] would move in that [using tactical nuclear weapons] direction in the current conflict."

"I don't see Putin deciding to use a nuclear weapon."

"There are reasons to believe Moscow would not press the nuclear button."

"Though it is unlikely that Russia will use nuclear weapons in Ukraine, the risks are real."

Putin has sent many signals that "he will use battlefield nuclear weapons from his arsenal of 6,000 such weapons to win the war."

"Well, yes, he [Putin] would [launch a nuclear attack]."

Would Putin Detonate Nuclear Weapons in Ukraine?

The New START treaty, which limits the deployment of strategic nuclear warheads to 1,550 per side and delivery systems to 700, expired on February 5, 2026. This marks the first time in more than half a century that the United States and Russia face a world without binding limits on their strategic nuclear arsenals.

The New START treaty, which limits the deployment of strategic nuclear warheads to 1,550 per side and delivery systems to 700, expired on February 5, 2026. This marks the first time in more than half a century that the United States and Russia face a world without binding limits on their strategic nuclear arsenals.

Russia proposed extending the treaty's limits for one year after expiration, but the United States did not provide a formal response to the proposal. The Russian Foreign Ministry stated that both parties are no longer bound by obligations under the treaty.

Russia proposed extending the treaty's limits for one year after expiration, but the United States did not provide a formal response to the proposal. The Russian Foreign Ministry stated that both parties are no longer bound by obligations under the treaty.

UN Secretary-General Antonio Guterres called the treaty's expiration a grave moment for international peace and security. He urged both Moscow and Washington to return to the negotiating table without delay and agree upon a successor framework.

UN Secretary-General Antonio Guterres called the treaty's expiration a grave moment for international peace and security. He urged both Moscow and Washington to return to the negotiating table without delay and agree upon a successor framework.

US Secretary of State Marco Rubio stated that President Trump would make a decision on arms control later and reiterated a call for a new agreement that includes China. China's nuclear arsenal is estimated at 550 strategic nuclear launchers, well below the 800 each of Russia and the US.

US Secretary of State Marco Rubio stated that President Trump would make a decision on arms control later and reiterated a call for a new agreement that includes China. China's nuclear arsenal is estimated at 550 strategic nuclear launchers, well below the 800 each of Russia and the US.

Security experts warn that without the treaty's limits, both countries could deploy hundreds of additional nuclear weapons within weeks and their arsenals could double within a few years. Russia and the US control more than 80 percent of the world's nuclear warheads.

Security experts warn that without the treaty's limits, both countries could deploy hundreds of additional nuclear weapons within weeks and their arsenals could double within a few years. Russia and the US control more than 80 percent of the world's nuclear warheads.

Pope Leo XIV urged both sides not to abandon the treaty's limits and called for concrete follow-up measures to avert a new arms race. Former President Barack Obama warned that the expiry could spark another arms race that makes the world less safe.

Pope Leo XIV urged both sides not to abandon the treaty's limits and called for concrete follow-up measures to avert a new arms race. Former President Barack Obama warned that the expiry could spark another arms race that makes the world less safe.

New START Treaty Expires, Ending Nuclear Limits Era

New START Treaty Expires, Ending Nuclear Limits Era

The Controversies

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Pifer

Alberque

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Hill

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New START Treaty Expires, Ending Nuclear Limits Era

New START Treaty Expires, Ending Nuclear Limits Era

The Controversies

Romney

Stavridis

Pifer

Alberque

Buchanan

Hill

Go Deeper

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