Sergiy Kulybyshev, a 45-year-old Ukrainian screenwriter and director, is serving his country in the way he knows best. Amid the world’s focus on the violent battles raging across swaths of the country and air attacks on cities, Kulybyshev is anxious to highlight an often forgotten “cultural war” being waged by Russia. Today, Kulybyshev hopes to harness the power of film …