The larger-than-life Russian leader has held power — with one title or another — for 15 years, and is set to reign for at least a decade more. Yet Putin remains inscrutable. With only a smattering of biographical details released to the public and his sometimes puzzling public appearances, scholars — and even many world leaders — still struggle to understand the man at the helm of the Kremlin. To glean a clearer picture, FRONTLINE took a closer look at some of the most identifiable aspects of Putin’s public persona.