Muscovy's recovery from the humiliating foreign occupations of the Troubles and her emergence as a great power owed a great deal to her ability to learn the art of patience. Muscovy's war with Sweden mostly took the form of operations against small Swedish garrisons in Karelia, Izhorsk and Livonia. The Treaty of Eternal Peace can be said to mark the point at which Muscovy achieved lasting geopolitical preponderance over the Polish-Lithuanian Commonwealth. Muscovy had won Polish and Ottoman recognition of the Tsar's sovereignty over left-bank Ukraine and had begun to exercise greater control over the Zaporozhian and Don cossack hosts. The Crimean khanate remained a threat to the towns of Sloboda Ukraine and the Belgorod Line. Muscovite military power, near exhaustion by the end of the Thirteen Years War, had revived very quickly and grown to impressive new proportions. To raise more revenue for paying the expanded foreign formation infantry a major reform of state finances was undertaken in 1677-81.