Denys Yaroslavskyi is angry. ... “There was no first line of defence. We saw it. The Russians just walked in. They just walked in, without any mined fields” he says. He shows me video from a drone feed taken a few days ago of small columns of Russian troops simply walking across the border, unopposed. He says officials had claimed that defences were being built at huge cost, but in his view, those defences simply weren’t there. “Either it was an act of negligence, or corruption. It wasn’t a failure. It was a betrayal”. Everyone knew that this incursion was...