From The Gates of Europe: A History of Ukraine, by Serhii Plokhy (Basic Books, 2017), Kindle pp. 159-161:
THE TURNING POINT in the internationalization of the Khmelnytsky Revolt took place on January 8, 1654, in the town of Pereiaslav. On that day, Bohdan Khmelnytsky and a hastily gathered group of Cossack officers swore allegiance to the new sovereign of Ukraine, Tsar Aleksei Romanov of Muscovy. The long and complex history of Russo-Ukrainian relations had begun. In 1954, the Soviet Union lavishly celebrated the tricentennial of the “reunification” of Ukraine and Russia. The implication was that all of Ukraine had chosen at Pereiaslav to rejoin Russia and accepted the sovereignty of the tsar. What actually happened at Pereiaslav in 1654 was neither the reunification of Ukraine with Muscovy (which would be renamed “Russia” by Peter I) nor the reunion of two “fraternal peoples,” as suggested by Soviet historians. No one in Pereiaslav or Moscow was thinking or speaking in ethnic terms in 1654. Bohdan Khmelnytsky’s speech at the council of Cossack officers, recorded in the materials of the Muscovite embassy, gives some idea of how the Ukrainian hetman presented and explained his actions:
We have convened a council open to the whole people so that you, together with us, might choose a sovereign for yourselves out of four, whomever you wish: the first is the Turkish tsar [sultan], who has often appealed to us through his envoys to come under his rule; the second is the Crimean khan; the third is the Polish king, who, if we wish, may still take us into his former favor; the fourth is the Orthodox sovereign of Great Rus’, the tsar, Grand Prince Aleksei Mikhailovich, the eastern sovereign of all Rus’, whom we have now been entreating for ourselves for six years with incessant pleadings. Now choose the one you wish!
No doubt, Khmelnytsky was playing games. The choice had already been made: he and the Cossack officers had decided in favor of the sovereign of Muscovy. According to the ambassadorial report, the hetman made his argument by appealing to the Orthodox solidarity of his listeners. Those taking part in the council shouted their desire for the “Eastern” Orthodox tsar as their ruler.
It sounded like one of the many religion-based alliances of the Reformation and Counter-Reformation: the Thirty Years’ War, in which the countries of Europe lined up largely on the basis of their religious identities, had ended only five years earlier. There is no need to blame either the Muscovite elites or their Ukrainian counterparts for not considering each other brothers and members of the same Rus’ nation. The two sides needed interpreters to understand each other, and Khmelnytsky’s letters to the tsar survived in the Russian archives largely in translations prepared by such official interpreters. The tradition of Kyivan Rus’ as represented by historical memory and religious belief still existed, but it was embodied only in a few handwritten chronicles.
Four centuries of existence in different political conditions, under the rule of different states, had strengthened long-standing linguistic and cultural differences that divided the future Belarus and Ukraine from the future Russia. Those differences came to the fore when Khmelnytsky and the colonels wanted to discuss conditions of the agreement with the Russian envoy, Vasilii Buturlin; he told them that the tsar would treat them better than the king had but refused to negotiate. Khmelnytsky objected, saying that they had been accustomed to negotiating with the king and his officials, but Buturlin responded that the Polish king, being an elective monarch, was not the equal of the hereditary Russian tsar. He also refused to take an oath with regard to the broad promises he had made to the Cossacks: the tsar, said Buturlin, swears no oath to his subjects. Khmelnytsky, who wanted Muscovite troops in battle as soon as possible, agreed to swear allegiance to the tsar with no reciprocal oath.
The Cossacks thought of the Pereiaslav agreement as a contract with binding obligations on both sides. As far as Khmelnytsky was concerned, he and his polity were entering into a protectorate under the tsar’s authority. They promised loyalty and military service in exchange for the protection offered by Muscovy. The tsar, however, perceived the Cossacks as new subjects toward whom he would have no obligations after granting them certain rights and privileges. As for his right to the new territory, he thought in dynastic terms. As far as he and his chancellery were concerned, the tsar was taking over his patrimony: the cities of Kyiv, Chernihiv, and Pereiaslav.
Far Outliers 