Paying for cloud

Try this -> Sign in to your Apple ID account page and edit your Apple ID details.

https://appleid.apple.com

On the Sidebar click Payment methods -> then tap Payments Methods and tap Manage payment method.

Or -> Change, add or remove Apple ID payment methods

Change, add or remove Apple ID payment methods – Apple Support (UK)

I'm have Sberbank accout. Can that cause problem ?

Could be, check if Sberbank is on the list, see -> Payment methods you can use with your Apple ID

Payment methods you can use with your Apple ID – Apple Support (UK)

If not, choose another payment method that you can use.

Contact Apple Support ->  Get Support (apple.com)