Pope Leo Warns of “New Arms Race” as Final U.S.-Russia Nuclear Treaty Expires

As the U.S.-Russia nuclear pact ends, the Pope urged world leaders to pursue a meaningful successor agreement.

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Pope Leo XIV during an audience with the media (May 12, 2025).

Edgar Beltrán, The Pillar .

As the U.S.-Russia nuclear pact ends, the Pope urged world leaders to pursue a meaningful successor agreement.

On Wednesday, February 4th Pope Leo XIV outlined the risk of “a new arms race”—with the final U.S.-Russia nuclear treaty now set to expire.

New START—the most recent nuclear treaty between Washington and Moscow, following decades of agreements dating back to the Cold War—is due to expire on Thursday, ending the remaining restrictions on the world’s two leading nuclear powers.

During his weekly general audience, Pope Leo stated:

I urge you not to abandon this instrument without seeking to ensure that it is followed up in a concrete and effective manner.… The current situation requires us to do everything possible to avert a new arms race, which further threatens peace between nations.

Leo, the Catholic Church’s first American pontiff, added that it was “more urgent than ever to replace the logic of fear and mistrust with a shared ethic capable of guiding choices towards the common good.”

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