Bohdan Khmelnytsky
Treaty with the tsar

After a series of negotiations, it was agreed that the Cossacks would accept overlordship by the Tsar Alexei Mikhailovich. To finalize the treaty, a Russian embassy led by boyar Vasily Buturlin came to Pereiaslav, where, on 18 January 1654, the Cossack Rada was called and the treaty concluded. Historians have not come to consensus in interpreting the intentions of the tsar and Khmelnytsky in signing this agreement. The treaty legitimized Russian claims to the capital of Kievan Rus' and strengthened the tsar's influence in the region. Khmelnytsky needed the treaty to gain a legitimate monarch's protection and support from a friendly Orthodox power.

Historians have differed in their reading of Khmelnytsky's goal with the union: whether it was to be a military union, a suzerainty, or a complete incorporation of Ukraine into the Tsardom of Russia.

The differences were expressed during the ceremony of the oath of allegiance to the tsar: the Russian envoy refused to reciprocate with an oath from the ruler to his subjects, as the Cossacks and Ruthenians expected since it was the custom of the Polish king.

Khmelnytsky stormed out of the church and threatened to cancel the entire treaty. The Cossacks decided to rescind the demand and abide by the treaty.
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