IPAD не удается подключиться к App Store.

What did they say when you called this number? Связаться с Apple Россия 8-800-555-6734

Unfortunately those are all the suggestions I have and I do not think I have seen any others from other contributors. Realize that this may be an issue specific to you in—presumably—Russia. Although this is a worldwide forum, I have yet to see anybody in Russia post here providing solutions, only asking questions. It may therefore be unlikely you will get somebody local who knows how to resolve this unless you can contact somebody doing Apple support. My understanding is that currently that is very limited in Russia so I encourage you to keep on trying other contact methods. The number I provided above is the one that is listed for Russia but it may only be available at limited hours.

I understand your frustration but this is a user to user support forum. Apple is not here. We are all volunteers on this forum which Apple provides for everyday customers to help other customers with issues that we may all experience. Sometimes we are better and more creative in providing solutions, but some issues are things only Apple can solve at their end. If it is a hardware issue they only you and they can determine that.

I am on the other side of the world from you. I have no problems connecting to the App Store so this is likely an issue local to you, either with your iPad or Apple's service where you reside. Some of those could be things that only Apple knows about. In fact I have never in 20 years had a problem connecting to the App Store so my suggestions are based on what Apple has in its support articles and what others have said here.

From browsing the forum I see a few reports of App Store problems from people posting in Russian, so I can only presume this is some issue specific to Russian users. However, that's only a few posts in 12 hours.

https://discussions.apple.com/thread/256259030

https://discussions.apple.com/thread/256258958

I try to contribute what I can but my resources are limited.

Do you have another way of trying to use the App Store? An iPhone or Mac computer? That would at least tell you if it is the iPad or something more general to your connection.

And do make sure you tried the things in that article, even the simple ones such as restarting your iPad.

Ask Apple.

https://support.apple.com/ru-ru/106932?choose-your-country-or-region=russia

I am not AI. I am somebody sitting at home helping people on this web site. However, I am apparently not doing anything you are perceiving as being informative. I hope you can find somebody who can help you.