Ukraine and Russia are taking the war underground as drones saturate the battlefield

Ukrainian President Volodymyr Zelensky last week heralded the success of Operation Veles, during which Kyiv sent troops deep into a disused gas pipeline in the Kupiansk region to confront Russian troops. These underground tactics, which Russian forces have been using for more than two years to slip past Ukrainian lines, are giving Kyiv a new strategy on the battlefield.