I think Oliver Stone has been a bit of an enigma his whole career. He actually doesn't have that much to do with the production of this movie, in fact the interviews he did with Putin were done on off days while filming "Snowden". We do need to give credit where credit is due though and acknowledge that as uncomfortable as Stone will make you feel with his research, he usually digs a lot deeper than others. (I'm referencing the "Winter on Fire" documentary specifically.)
I think what a person should do, is watch "Winter on Fire" then watch this movie. Reason being, in the very pro-west documentary, you won't think about some things in that documentary and other things you'll have questions about and wish they had dug deeper. Then this documentary explains why they didn't dig deeper.
I've read several comments that this is pro-Russia. I disagree, I think they explain how Russia has screwed over the Ukrainian people. They don't dwell on it the whole time because they want to explain the entire complexity of the situation. The reason Putin probably likes it is because it shows both sides of the story, and if we're frank about it, nobody looks good but at least you get the full story.
I'm American, but I lived in Russia from 1989-1993. I've spent a lot of time in Kiev. I can tell you from my first hand experiences, this documentary portrays the situation more accurately than anything else. The dots connected in this make more sense.
The reason I only gave it 8/10 is because the production value is lacking. It almost looks like they used an Envato template for some of the graphics. Everything outside of that is just great. It's more journalism than documentary.
Speaking of journalism, I think that will be the "red pill" moment for most people when comparing this and "Winter on Fire". Without giving too much away, look at how Tetiana Chornovol is portrayed in both documentaries. Considering there is footage of her doing some of these specific actions in this documentary, I think you can see why this one is likely closer to the truth.