This important day arrives amid rising geopolitical tensions and growing nuclear risks — including the disturbing prospect of a return to nuclear testing.

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In 2025, we commemorate the 80th anniversary of the first nuclear test. We must never forget the legacy of over 2,000 nuclear weapons tests carried out over the last 80 years.

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The effects of these explosions have been horrific.

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Nuclear tests drive displacement and contaminate lands and oceans. They sow the seeds of long-term health crises, including cancers and other chronic illnesses. And they deepen the cracks in the foundation of global trust, stability and peace.

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We cannot accept this.

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The Comprehensive Nuclear-Test-Ban Treaty remains the only internationally agreed, legally binding instrument to end all nuclear tests. Its entry into force, long overdue, is more urgent than ever. I call on all countries to ratify it — immediately and without conditions.

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My message to leaders is simple: stop playing with fire. Now is the time to silence the bombs before they speak again.