Re: Will there be a Hearing Aid function on airpods pro2 in Russia?
Seems likely that no-one here in the Apple Support Community could answer yes or no for you.
Apple seldom announces what it will do ahead of time, and the latest AirPods Pro 2 hearing health features require approval from the local government authorities before they can be released in that country. You may want to ask the corresponding authority in Russia about approval for use.
(Eg In USA it is the Food and Drug Administration (FDA),
in Australia it is the Therapeutic Goods Administration (TGA) that gave approval)
Countries on the list you mention (link below) are those whose appropriate government authorities have approved the hearing health features use in that country.
AirPods Pro 3 - Hearing Health Feature Availability - Apple
The list keeps growing as countries give approval, and features are released by Apple.
__________________________________________________________________________________
Re: "I really need some hearing aid with hearing aid support, as one of my ears is hard of hearing."
You may want to consult a hearing health professional for their expert advice,
Your AirPods Pro 2 would already have access to the various hearing assistance features that were released prior to the hearing-aid heath features that require authorisation.
_____
✽ You can customize headphone audio levels on your iPhone or iPad:
Eg: Use Conversation Boost on your AirPods Pro
Customize headphone audio levels on your iPhone or iPad - Apple Support
Says:
"Amplify soft sounds and adjust certain frequencies for your hearing needs
with Headphone Accommodations in iOS and iPadOS 14 and later."
and
"To automatically detect if a conversation is happening in front of you
and focus your AirPods Pro on the person speaking to you, turn on Conversation Boost".
_____
✽ You might want to experiment with the different noise-control modes:
Active Noise Cancellation and Transparency modes for AirPods - Apple Support
Eg: says:
"You can switch between Active Noise Cancellation and Transparency
listening modes on your AirPods Pro and AirPods Max, depending on how
much of your surroundings you want to hear. You can also turn off listening modes".
_____
✽ If you want: you can Use Adaptive Audio with your AirPods - Apple Support
Eg: says:
"Adaptive Audio, Personalized Volume, and Conversation Awareness respond
to your environment automatically to optimize your audio experience."
_____
✽ Use Live Listen with AirPods or Beats - Apple Support
Eg: says:
"With Live Listen, your iPhone or iPad can act like a microphone that sends sound to your AirPods or Beats. Live Listen can help you hear a conversation in a noisy area or even hear someone speaking across the room."
_______________________________
Useful online resource: AirPods User Guide - Apple Support
More support . info. if needed:
Find all the topics, resources, and contact options you need for your AirPods....
AirPods Support Website: AirPods Support - Official Apple Support