The famous Russian leader who initiated significant reforms in the early 20th century is Petr Stolypin. Serving as Prime Minister from 1906 until his assassination in 1911, Stolypin implemented crucial reforms aimed at modernizing Russia’s agriculture and political landscape. His policies focused on land reforms that were intended to strengthen the peasantry and stimulate economic growth, as well as suppress revolutionary movements. His tenure is often recognized for the phrase, "You must be decisive," reflecting his approach to governance during a tumultuous period in Russian history.