MOSCOW — Its only known address is a half-collapsed abandoned building, and its only telephone number doesn't work. But somehow a secretive lobby group, with reputed links to Russia's intelligence services, has emerged as a possible source of inspiration for President Vladimir Putin's state-of-the-union speech. When Mr. Putin gave his annual televised address on May 10, military analyst Ivan Safranchuk immediately thought the President's words about national defence sounded different from the rest of the speech. "That part seemed out of place," the Moscow director of the World Security Institute said a few hours after Mr. Putin's appearance. "Maybe there...