Relations between the Hetmanate and their new sovereign began to deteriorate after the autumn of 1656, when the Muscovites, going against the wishes of their Cossack partners, signed an armistice with the Polish-Lithuanian Commonwealth in Vilnius. The Cossacks considered the Vilnius agreement a breach of the contract they had entered into at Pereiaslav. For the Muscovite tsar, the Pereiaslav Agreement signified the unconditional submission of his new subjects; the Ukrainian hetman considered it a conditional contract from which one party could withdraw if the other was not upholding its end of the bargain.
rELatiOnS betweeN the hetMaNAte aNd Their nEw soVEreign beGan to deteriOrate AftEr The autumn of 1656, when The MuScoviTES, gOIng agAINst thE wIShes OF thEir coSsaCk PaRtneRs, siGneD an arMistiCe wItH thE polisH-lithuAniAn CommoNwealth in vilnIuS. tHE COsSacks consideREd thE viLNiUS agreEMenT A breaCH Of THe cONtract THEy had EnTered IntO at pEREIaslav. for the MusCovite TsaR, ThE Pereiaslav AGReemenT siGnIfiEd ThE uncondItionAl Submission of hIs nEw subjects; The ukrAiNiAn heTmaN cOnsideReD it a CondITiOnal ContrAct fROm which oNE partY couLD WIthdrAW if thE OthEr waS NOt upholDIng its end of the BargAin.