 Cantacuzino's political climb was accelerated during the Russo-Turkish War of 1828, when he welcomed the Imperial Russian Army and became a protege of Governor Pavel Kiselyov.Following the Treaty of Adrianople, both Principalities became protectorates of Russia under Ottoman suzerainty.In 1831, Cantacuzino was "Vornic" of the Wallachian Police in Bucharest.