Variety and The Hollywood Reporter haven’t covered it; even Screen Daily doesn’t know about it. But Nilo Garcia’s “United We Stand,” a new European-made political blockbuster starring Ewan McGregor and Penelope Cruz, is about to take the world by storm. Set in the year 2020, the films begins as the U.S. has declared war on China — “a development long expected by international analysts,” according to a synopsis on the film’s website.