Sorry to disappoint you Brian, but I myself have dealt with numerous cases of scamming in all sorts of settings and scenarios. Having the phone number means NOTHING at all, neither does any official documentation. What I strongly advise you is to use skype (it is still in use, even in the areas under siege), whatsapp, facebook and / or VK. See, if she lets you come closer to her. If she has an operating mobile, it will also be accessable to any or all of the soc nets I mentioned.
Travelling to Kiev might prove difficult but Kharkov is always an option, putting the main strain of thr journey on you, but then you're the man  
If you have doubts or get excuses from her why things will or would not work, you can always get in touch with the admins on this site. They do a great job eliminating scammers, fraudsters and tricksters.
Good look for all your endeavours!