Hello!
I am a journalist who conducts investigations in Ukraine. And by experience I will say that it is possible to check the reality of the company's existence by 100% only after seeing it in my own eyes. But this does not guarantee that the company is working officially, that it is all right with the documents.
The second way is to take the document from a single state register of firms. But the second service is paid, so $ 30 will not be enough.
If the company is in Kiev or Nikolaev, I can see her work personally.