Several times over the past three months, swarms of as many as 150 Ukrainian drones flew hundreds of miles into Russia, slamming into missile storage facilities, strategic fuel reservoirs, military airfields and defense plants.

       Once considered exceptional, these deep strikes now barely register in the news. Yet, Ukrainian officials and some of their Western backers increasingly see the pain that long-range attacks inflict as a game-changer that could force President Vladimir Putin into negotiating an acceptable peace.

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