The turn occurred after the conclusion of the Shuisky alliance with the Swedes, alarmed by the strengthening of hostile Poland. On February 28, 1609, in Vyborg, the young nephew of the Tsar, Mikhail Skopin–Shuisky, signed an agreement with the Swedish King Charles IX, who promised to provide an army in exchange for the Korelsky District and an alliance for the conquest of Livonia. On May 10, Skopin set out from Novgorod and moved towards Moscow, crushing Tushino troops on the way. In July, he defeated Sapega at Kalyazin. On February 6, 1610, Sapega was forced to lift the Siege of Trinity and retreat to Dmitrov.