Well, she can, but it's not like they give out visas as a wedding gift. Start putting together evidence of your relationship. Chat history, call logs, photographs together, any joint accounts or assets, gifts sent/received. Make a timeline of your relationship; day you met in person, when you have visited each other etc. You probably will have to live in Ukraine for a while after you marry, because if you've never lived together, they probably wont see the relationship as genuine. you should have joint rental contract, utilities etc if possible. how you share finances and manage your home together. you need to provide objective evidence for all these, statements arent enough. you will also need statements from 2-4 people who know both of you and can make some comment on your relationship. After all this, there is the wait for processing, and it will be months. I'm sponsoring my partner, we are married and now been separated 5 months as I needed to return to Australia for medical reasons. Still waiting for his visa. Approval times do depend on the embassy where you lodge but it can be up to 15 months waiting so be prepared for that.