Just received the following from V.Partners:

Dear partners!

We would like to inform you about several important changes regarding geo restrictions.
Registration of new users is now closed for:

Germany and Russia - on Vulkan Bet
Ukraine - on Vulkan Vegas
Czech Republic - on all V.Partners projects

Due to this information, please stop all active campaigns - in case of any changes we will let you know. If you have any questions please contact your manager or V.Partners support.

V.Partners team