Ukraine and Russia have escalated their shadow war of espionage, sabotage, and assassinations, with both countries claiming a growing list of captured agents, intercepted plots, and cross-border attacks.

At least six people were killed, with over 20 people wounded, into early Saturday as Russia continued to hammer Ukraine with hundreds of drones as part of a stepped-up bombing campaign that has further dampened hopes for a breakthrough in efforts to end the more than three-year-old war.