The Treaty of Buchach was signed on 18 October 1672[1] in Buczacz (now Buchach, Ukraine) between the Polish-Lithuanian Commonwealth and the Ottoman Empire, ended the first phase of the Polish-Ottoman War (1672-1676). King Michał Korybut Wiśniowiecki, unable to raise a suitable army against the Ottomans and Petro Doroshenko's Cossacks who laid the siege of Lviv.