Ukraine is caught in the middle of the impeachment proceedings against U.S. President Donald Trump, who is accused of trying to solicit Kyiv’s interference in next year’s presidential election. Democrats say Trump tried to blackmail Ukraine to investigate the business dealings of Hunter Biden, the son of his rival, Joe Biden. Republicans say there are legitimate questions that must be answered. Ukraine’s new prosecutor general will be central to the future course of the investigations, as Henry Ridgwell reports from Kyiv