Russian ex-spy pressured Manafort over debts to an oligarch

When the U.S. government put out its latest sanctions list on Dec. 19, the man named at the top did not seem especially important. Described in the document as a former Russian intelligence officer, he was accused of handling money and negotiations on behalf of a powerful Russian oligarch. The document did not mention that the man, Victor Boyarkin, had links to the 2016 campaign of President Donald Trump.

A months-long investigation by TIME, however, found that Boyarkin, a former arms dealer with a high forehead and a very low profile, was a key link between a senior member of the Trump campaign and a powerful ally of Russian President Vladimir Putin.

In his only interview with the media about those connections, Boyarkin told TIME this fall that he was in touch with Trump’s then-campaign chairman, Paul Manafort, in the heat of the presidential race on behalf of the Russian oligarch. “He owed us a lot of money,” Boyarkin says. “And he was offering ways to pay it back.”