Hadziacz Agreement

The Hadziacz Agreement, signed in 1658, was an accord between the Polish-Lithuanian Commonwealth and Bohdan Khmelnytsky's successor in Ukraine. This agreement aimed to establish Ukraine as a third member of the Commonwealth, granting it its own state, army, and administrative offices, along with ennoblements for Cossacks and a suspension of the Union of Brest-Litovsk.12

However, the accord was short-lived. A pro-Russian faction within Ukraine denounced and nullified the pact. This led to renewed hostilities with Muscovy, culminating in the Truce of Andrusovo in 1667, which divided Ukraine along the Dnieper River. This event marked a significant step in the decline of the Commonwealth's international standing. The Pereyaslav Agreement of 1654, which preceded this, involved Ukraine submitting to Russian rule, initiating a war between Poland and Russia.123