Citizen K (15)****

Dir: Alex Gibney

With: Mikhail Khodorkovsky, Vladimir Putin, Leonid Nevzlin

Runtime: 126 minutes

OSCAR-winning documentary maker Alex Gibney turns his attention to Mikhail Khodorkovsky, king of the Russian oligarchs, the businessmen who made fortunes buying up state assets for knockdown prices, Khodorkovsky and his ilk did extremely well from the collapse of the Soviet Union. As long as the state remained weak their dealings were tolerated. Then along came Vladmir Putin who saw them as thieves who needed to be put in their places. Khodorkovsky made the mistake of pushing back, much to his eventual cost. Gibney has scored a coup in getting the man himself, and he is blessed by such talking heads as Martin Sixsmith, the BBC’s former man in Moscow. The film is a touch long, but this is as much a history of modern Russia as it is a cautionary tale about Putin. As for Khodorkovsky, capitalist turned campaigner for democracy, he is no angel but he is one tough, courageous son of a gun.

GFT and Filmhouse, Edinburgh, until December 24