Ukraine has targeted Russian energy facilities in one of its largest cross-border drone and rocket attacks of the war, disrupting production at a major oil refinery as armed groups also claimed to have launched a large raid across the border from Ukraine.
The chaotic day in Russia, which also included a military air transport crash that killed all 15 people on board, comes at a sensitive moment as Vladimir Putin has sought to project an image of calm and control ahead of presidential elections this weekend.
