Just use Russia VPN. You may rent any of the Russian VPS or purchase a commercial VPN. It seems YouTube does not target advertising to Russians.
The funny experiment: you may surf YouTube from Russia, then turn on a European VPN, and whoops!.. Non-stop advertising!
Pay for youtube premium.
Or if you have the energy to make an adblocker, instead of making an adblocker, direct it at some kind of project you could be paid for instead, and use those proceeds to get YT premium.