One of the troubling questions at the center of the impeachment inquiry, at least for Republicans, has been the work that Hunter Biden did for Burisma, one of Ukraine’s largest gas companies, while his father was serving as Vice President. But the intensity of interest in Washington is only making it more difficult to resolve the mystery.

To this day, Burisma’s connection to Hunter Biden has made it much harder for Ukrainian authorities to investigate the company for corruption, current and former officials in Ukraine tell TIME. In that sense, Burisma is still getting its money’s worth for the reported $50,000 per month it paid the younger Biden to sit on its board from 2014 until earlier this year.

“It’s too sensitive a topic,” says an official in Kyiv, who would only discuss the company’s case on condition of anonymity. “I think that we need to investigate Burisma. Not for Trump. And not against Biden. We need to do that because this is just a case of corruption,” says the official, who is familiar with the thinking of Ukrainian President Volodymyr Zelensky. But the impeachment inquiry has “changed the context” around alleged corruption at Burisma, adds the official. “And this is bad.”

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