You can find out about the restrictions or ban on crossing the border of Ukraine in several ways, but the most reliable of them is to submit a written request to the Main Special Information Processing Center of the State Border Service of Ukraine.
You can check whether you are banned from leaving online by following the most popular reasons for refusal to cross the border:
Register of debtors
Register of court decisions
Register of executive proceedings
Register of tax arrears
Register of fines for traffic violations.