Investigative journalist Roman Dobrokhotov has spent more than five years researching the shooting down of Malaysian Airlines Flight 17, which killed 298 people in 2014.

"I think there are not so many things in the world that are proven better than that Russia is responsible for shooting down MH17," Roman tells me. "We have photos, we have audio recordings of telephone calls, we have witnesses, we have interviews with people who were on the ground."