If you are a Ukrainian citizen, and a holder of a biometric passport, you will be able to travel to Schengen without a visa from June 11th, 2017.
If you are citizen of other country, you may need an entry visa. An entry visa is a permit required by persons wishing to enter Sweden for a temporary visit, for example:
Citizens from the following countries/territories require a visa when entering Sweden.
Check the list of countries on the government’s web site.