On Bloomberg’s ‘Balance of Power’ with David Westin: Leon Panetta, former U.S. Secretary of Defense, on Vladimir Putin's possible next steps in Ukraine; Jim Messina, former White House Deputy Chief of Staff under President Obama, on Democrats tackling midterm elections; Aneta Markowska, Jefferies Chief U.S. economist, on recession and inflation; Dan Brouillette, SEMPRA Infrastructure president, on energy challenges in the U.S. and Europe.