Entry with visa into Ukraine
If you are coming to Ukraine you need to obtain an appropriate visa.
The visa is the valid permission. It is provided by authorized body of Ukraine in the form established by the legislation. It necessary for entry into Ukraine or for transit through the territory of Ukraine during the corresponding term.
Obtaining of the visa to enter
The first stage: you'll need to obtain an official invitation from the legal entity or individual (we can perform such function). This document is called the official invitation (you can see details here).
The second stage: you must submit this invitation along with the visa application form, two passport size photo and travel document (passport) to the Ukrainian Embassy / Consulate to obtain Ukrainian visa (you can see details here).
You can see the example of the visa here.