After the Crimean Tatars betrayed the Cossacks for the third time in 1653, Khmelnytsky realized he could no longer rely on Ottoman support against Poland, and he was forced to turn to Tsardom of Russia for help. Final attempts to negotiate took place in January 1654 in the town of Pereyaslav between Khmelnytsky with Cossack leaders and the ambassador from Tsar, Vasiliy Buturlin. The treaty was concluded in April in Moscow by the Cossacks Samiilo Bohdanovych-Zarudny and Pavlo Teteria, and by Aleksey Trubetskoy, Vasilii Buturlin, and other boyars. As a result of the treaty, the Zaporozhian Host got an autonomous status of the Hetmanate within the Russian state. The treaty also led to the Russo-Polish War of 1654–1667.