It means they won't spend time or resources troubleshooting new network issues for regions that are under sanctions.
Users that have the option to create non-RU accounts might still be able to login to the game and bypass the TAPIR error.
English
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It is not a just some kind of network erorr. It is restriction by 2 params - ip adress and country of account. so there is nothing to trobleshoot because THEY did it purposefully
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They "shadow banned" IP of CIS. So non-CIS account will not help. I've accounts on epic games (turkish) and steam (argentinean) and still can't play