Craig Unger, an American journalist and writer who has written two books on Trump’s connections to Russia’s security services and the Russian mafia stretching all the way back to the 1980s, says he is “absolutely certain” that the U.S. president is a Russian asset.

According to Unger, Trump’s current actions are benefiting Russian President Vladimir Putin, and destroying relationships with long-time allies.

The Kyiv Independent sat down with Unger to hear what makes him so certain.