Sean Penn premiered "Superpower", his admiring portrait of Ukrainian President Volodymyr Zelensky at war, telling the Berlin film festival Saturday the movie was also a wakeup call about Americans' own fragile democracy. - 'Propagandist' -Zelensky joined Penn by video link at the festival's opening ceremony Thursday to ask for the entertainment industry's sustained help in keeping Western countries united behind Ukraine. In addition to Zelensky, Penn speaks with diplomats, reporters and analysts as well as Ukrainian soldiers and pro-democracy activists to offer an "idiot's guide" to the last decade of Ukrainian history. Penn argues that Ukraine could be now seen as "the better us" -- a new global beacon for freedom and democracy. "These people are doing what they have to do simply because they love their country and they love each other," he said.