However, with all this positive appreciation of his legacy, even in Ukraine it is far from being unanimous. He is criticised for his union with Russia, which in the view of some, proved to be disastrous for the future of the country. Prominent Ukrainian poet, Taras Shevchenko, was one of Khmelnytsky's very vocal and harsh critics. Others criticize him for his alliance with the Crimean Tatars, which permitted the latter to take a large number of Ukrainian peasants as slaves. (The Cossacks as a military caste did not protect the "kholopy", the lowest stratum of the Ukrainian people). Folk songs capture this. On the balance, the view of his legacy in present-day Ukraine is more positive than negative, with some critics acknowledging that the union with Russia was dictated by necessity and an attempt to survive in those difficult times.