 The international situation of the Cossacks and Polish-Lithuanian control over the vast areas of Kiev Voivodeship was further complicated by the fact that the rulers of Muscovy and Austria (Feodor I and Rudolf II, respectively) wanted to win the support of Cossacks in their struggle against the Turks.In 1591 the so-called Kosiński Uprising started.What started as a private quarrel between one disgruntled Polish noble and some local Ruthenian magnates soon turned into a full-scale civil war between local Ruthenian nobility and the Cossacks.