Visa requirements for Ukrainian citizens
For traveling to certain countries, Ukrainians do not need to use a passport, as they may use their Ukrainian identity card or internal passport.
Documents which give the right to leave Ukraine and to enter Ukraine and certify the identity of a citizen of Ukraine while staying abroad are:It's important to know, that the special rules of arriving in a particular country should be studied carefully. Thus, in most countries that do not require visas or issue visas, upon arrival you must have a passport, which is valid for at least 3 months from of arrival to this country.
Visa policy of Russia
As of 2014 the disputed territory of Crimea is under Russian control and Russia enforces its visa policy there. However, Ukraine requires that foreigners should comply with Ukrainian visa regime including obtaining a Ukrainian visa if one is necessary. Otherwise, Ukraine may impose sanctions for "support of the temporary occupation of the Ukrainian territory".