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.

Ukrainian Security Service says two Russian FSB agents suspected of killing Colonel Ivan Voronych on July 10 have been "neutralized" in Kyiv Oblast.

Ukrainian intelligence agents on Sunday killed members of a Russian secret service cell wanted on suspicion of having shot dead a colonel in Ukraine's SBU security service last week, the SBU said.