You need to check if your country is on the list of visa required ones. The link to the countries that need to arrange the visa to Ukraine is here, visa-online ones – here.
If you need to prove the purpose of your visit we can send you a booking voucher after you prepay the tour.
For most of the countries of Europe, North America, and CIS countries the government of Ukraine allows visa-free stay for 90 days.
All you need to do is book the tour and buy the ticket to Kyiv!