FilmBuff will release “The Russian Winter,” a documentary about singer-songwriter John Forte’s concert tour, on Oct. 23.The film, directed by Petter Ringbom, premiered at April’s Tribeca Film Festival. “The Russian Winter” will be available on movies-on-demand and VOD services. Following the commercial release of the documentary, Forte plans to release a full-length studio soundtrack from the film. Featured players in “The Russian Winter” include Raekwon and Natasha Bedingfield. Forte also performed with SunSay, Alina Orlova, Billy’s Band, Zero People, Margulis and Romario. The trip, which began in February 2011, took Forte from Moscow to St. Petersburg, Nizhny Novgorod, Kazan, Ekaterinburg and other stops along the Trans-Siberian Railway.