The two men held at gunpoint came from an island on the Dnipro River in the proverbial gray zone separating the Ukrainian-controlled western bank from the Russian-occupied east.At the port, “officials in charge of ‘stabilization measures’ check if people were involved” with the Russian occupiers, he adds.Throughout Kherson, officers inspect identification papers, question residents and search cars hoping to smoke out collaborators — some of whom they fear are still providing information to their old masters.At the city’s train station, AFP journalists saw policemen take the few civilians hoping to board a train into a separate room where they were quizzed by five officers.For the regional governor, the campaign “helps us identify them, know if they are on the territory we control.”“We get most of our information from informal conversations with locals… We also analyze social media and monitor the internet,” Andriy Kovanyi, the head of public relations for Kherson regional police, tells AFP."