Some countries don't need to apply visa to travel to Ukraine. This concession is extended to citizens of the United Kingdom and other European Union (EU) and European Economic Area (EEA) states, the United States of America, Canada and Japan. The List of countries which have the Visa-free movement regime with Ukraine is available here

Participants who need a visa to enter Ukraine should submit the necessary application to the nearest diplomatic or consular representative of Ukraine in country of their residence.
Organizing Committee will sent the Formal Invitations for getting Ukrainian visa by request of participants after the decision on abstract acceptance.