COMMON CHALLENGES U.S. Defense Secretary Robert M. Gates speaks with junior officers at the new State Russian Naval Museum in St. Petersburg, Russia, March 21, 2011. Gates is visiting Russia to meet with officials there and also discuss defense reforms under way in both nations, global security and arms-control issues. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 816218-P-OYJ07-806.jpg Photo Gallery