Add payout methods for Ukraine citizens
PayPal payout method is restricted in Ukraine. It's not possible to receive money through PayPal if you are a citizen of Ukraine (you can only send money through PayPal if you are a citizen of Ukraine).
Please, check which functionality is available depending on country here (select Ukraine in a drop-down list):
I think, you either should add a payout possibility or restrict Ukraine citizens to make deliver offers (because they won't be able to get their money back by using your service).