A flying object explodes in an intense burst of light near the dome of the Kremlin Senate building during the alleged Ukrainian drone attack in Moscow in an image taken from video obtained by Reuters May 3.OSTOROZHNO NOVOSTI/Reuters Russia accused Ukraine on Wednesday of attempting to kill President Vladimir Putin with drones, warning it would retaliate “anywhere and anytime.” The Ukrainian government immediately denied involvement in the incident, which came as the Ukrainian military is preparing for a long-anticipated counteroffensive aimed at liberating Russian-occupied territories. The incident immediately raised fears that Russia would use it to justify some kind of...