I think that I recognize the parent's allusion. The film is Ukraine on Fire, directed by Igor Lopatonok.

https://en.wikipedia.org/wiki/Ukraine_on_Fire

The executive producer (better known for his work as a director) was Oliver Stone. You can buy it on DVD from several major retailers or pay to get it instantly via streaming on Amazon Prime.

The reason "few US citizen seem to know about it" is probably because most US citizens don't watch political documentaries.