Pope Leo XIV called on Russia and the United States to extend the New START nuclear arms control treaty, which limits the number of strategic nuclear weapons deployed by each country. Speaking at his weekly audience at the Vatican, the pope emphasized that the current global situation “calls for doing everything possible to avert a new arms race.”

Signed in 2010, the treaty is set to expire on Thursday. Russian President Vladimir Putin proposed an informal one-year extension in September, but as of Wednesday, U.S. President Donald Trump had not responded, raising concerns about the potential lapse of the agreement.

The pope described the renewal as urgent, stressing the need to replace “the logic of fear and distrust with a shared ethic” that prioritizes the common good. Letting the treaty expire would mark the end of over 50 years of nuclear weapons constraints, a significant step in global arms control.

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