this doc isn't as gripping as it should be, mixing reconstruction with fly-on-the-wall footage of Petrov picking up an award at the UN in New York - and hilariously mistaking Matt Damon for Robert De Niro's son
Sergey Shnyryov is superb as Petrov's fictional counterpart, and the present and the past are smoothly sutured together by deft editing and an insistently mournful string score