Eighteen months into Vladimir Putin’s war on Ukraine, two things seem clear. First, the war matters. After 15 years of failed Western responses to Russian aggression against Georgia and Ukraine, another failure to contain and deter Russia would have catastrophic consequences around the world.

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This photograph shows a Dassault Rafale aircraft parked on the tarmac of the French Air and Space Force Luxeuil-Saint-Sauveur Airbase in Saint-Sauveur, France, on March 18, 2025. (Ludovic Marin/AFP via Getty Images)