Howdy Limnos
Off topic & on topic at the same time
I got curious about Russian language versions - your latter one looked "old style" to me
- Change your apple ID page(s) - see extra PathName in bold - your URL redirects to the current page, fortunately
Change your Apple ID - Apple Support > https://support.apple.com/en-us/HT202667
Изменение идентификатора Apple ID - Служба поддержки Apple > https://support.apple.com/ru-ru/HT202667
I rarely use the FlagBadge - if I know the PathName change I need to make, that is - it seems that "Manage Your Apple ID" page's country is NOT in the URL, but some other method (cookie?) - change only by using the FlagBadge at bottom right of the page.
My guess is that if a Russian was already using Apple.com, they would be presented with Russian language even with the "plain" URL
I change to Russian and back again resulting in no change to the URL below
Manage your Apple ID - Apple
https://appleid.apple.com/#!&page=signin
It is no wonder that ASC & other AppleWebWorld pages sometimes go a little nuts