Matt Donnelly Senior Film Writer In his new documentary “Superpower,” Sean Penn assesses Ukraine’s ongoing war with Russia and the meaning of the word “freedom” in a world gone mad. He’s also revisits his own past with Russian leader Vladimir Putin, a moment that Penn calls a dark memory from decades before he would meet up with embattled Ukrainian president Volodymyr Zelenskyy. In the doc, Penn recalls a 2001 visit to the Moscow Film Festival where his directorial effort “The Pledge” was premiering.