Seeking supremacy in Eastern Europe, the Commonwealth fought wars with Russia between 1605 and 1618 in the wake of Russia's Time of Troubles; the series of conflicts is referred to as the Polish–Muscovite War or the "Dymitriads". The efforts resulted in expansion of the eastern territories of the Polish–Lithuanian Commonwealth, but the goal of taking over the Russian throne for the Polish ruling dynasty was not achieved. Sweden sought supremacy in the Baltic during the Polish–Swedish wars of 1617–1629, and the Ottoman Empire pressed from the south in the Battles at Cecora in 1620 and Khotyn in 1621. The agricultural expansion and serfdom policies in Polish Ukraine resulted in a series of Cossack uprisings. Allied with the Habsburg Monarchy, the Commonwealth did not directly participate in the Thirty Years' War. Władysław's IV reign was mostly peaceful, with a Russian invasion in the form of the Smolensk War of 1632–1634 successfully repelled. The Orthodox Church hierarchy, banned in Poland after the Union of Brest, was re-established in 1635.