Despite the fact that Belarus belongs to the countries with visa-free entry to Ukraine, stateless persons entering the territory of Ukraine must obtain a visa .This is spelled out in Section III of Article 25 of the Law of Ukraine on 04 .02 .1994 No. 3929-XII "On the rightful status of citizens and individuals without citizenship", which determines the legal status of foreigners in Ukraine - $ .According to the Law, foreigners and stateless persons can enter Ukraine in accordance with the relevant valid passport documents .At the same time, foreigners and stateless persons must obtain an entry visa in accordance with the established procedure, unless otherwise stipulated by the legislation of Ukraine..You can find the law completely here .