Never ever pay money to Ukrainian woman! NEVER!!!!!
I am a serious man, but I know all those stories for what they need your money.
They only want your best! - YOUR MONEY !!
Ukrainians are like smart foxes.
If you really like her then take your time, buy a flight ticket and meet her in her town. If she is a scammer then relax and make you nice days in this town. Go to restaurant, shops, for a walk and go back home. So you will have some nice days for yourself. If she comes to the meeting - fine.
NEVER SEND MONEY !!!!