The Russian plans included not only incorporation of Ukraine, but also recovery of the lands lost by Russia further north. The Ottoman Empire and the Crimean Khanate, worried by the new configuration, were now inclined to support the Commonwealth. With the Tatars the Polish units waged a destructive raid into Ukraine and fought in early 1655 the victorious Battle of Okhmativ against combined Russian and Ukrainian forces. Later that year Khmelnytsky counterattacked, took Lublin and reached the Vistula, but was forced to acknowledge John Casimir's supremacy again when his efforts were thwarted by the Tatars. Until his death in 1657 the Cossack leader, despite the Pereyaslav treaty, conducted independent policy, intent on taking advantage of the calamities that had befallen upon the Commonwealth, but also considered an improvement of the relationship with the great power that he shook up ("fatally wounded", according to historian Timothy Snyder).