in the campaign “Muscovite–Ukrainian War (1658–1659)”
Seeking to weaken the Hetmanate from within and prevent it from breaking vassalage, Moscow artificially fomented civil war, supporting and arming the internal opposition against the lawful hetman: "The proclamation of I. Vyhovsky as hetman was received negatively by the representatives of the forces opposed to him," led by Poltava colonel Pushkar and kish otaman Barabash[1]. Their revolt opened the period of the bloody Ruin.