Where can I replace broken screen of my iPad in Ukraine?

iPad Service and Repair - https://support.apple.com/ipad/repair/service

Click on this link to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> https://locate.apple.com/country or see if you can find any service locations in https://locate.apple.com/findlocations Some places with limited support may be included in the "other" link at the bottom of a region selection.

It will probably be very expensive to repair.

You maybe better off looking at new and/or newer iPad models.