Vasile Lupu, the ruler of the Moldavian principality, maintained friendly relations with Bohdan Khmelnytsky from October 1648, but he also sent information about the state of the Zaporozhian Army to Warsaw and lent the royal government money to hire soldiers.

Bohdan Khmelnytsky convinced his ally, the khan İslâm III Giray to accompany him on a campaign to Moldavia, mentioning the Moldavian attacks on Tatar detachments returning from the Polish—Lithuanian Commonwealth in 1648.

Vasile Lupu sent Khmelnytsky, who was staying in the north of Moldavia near Kamianets-Podilskyi in order to be ready for a potential Polish intervention, many gifts, among which was a sable coat covered with gold as well as a payment of 12-40 thousand thalers.

Moldavia agreed to a royal marriage of Khmelnytsky's son Tymofiy to the daughter of Lupu, Ruxandra, as well as the revocation of the Moldavian-Polish alliance.

[1][4] In 1651 the Cossack-Polish war resumed; the Cossacks suffered a major defeat at the battle of Berestechko, following which Vasile Lupu refused to go through with his obligations.