LIST of States whose nationals can enter to Ukraine without a visa if their stay Ukraine does not exceed 90 days from the date of entry:

Republic of Austria 
Principality of Andorra
Kingdom of Belgium
Republic of Bulgaria 
Vatican
United Kingdom of Great Britain and Northern Ireland 
The Hellenic Republic 
Kingdom of Denmark 
Republic of Estonia 
Ireland
Republic of Iceland
Kingdom of Spain
Italian Republic
Canada 
The Republic of Cyprus  
Republic of Latvia
The Republic of Lithuania
Principality of Liechtenstein
Grand Duchy of Luxembourg 
Republic of Malta 
Principality of Monaco 
Netherlands
Federal Republic of Germany 
Kingdom of Norway
Poland
Portuguese Republic
Romania 
The Republic of San Marino
The Slovak Republic
Republic of Slovenia
United States     
The Republic of Hungary     
Republic of Finland  
The French Republic     
Czech Republic    
The Swiss Confederation     
Kingdom of Sweden     
Japan.

All other countries need visas to enter Ukraine.