500MW at 30J/TH efficiency is 17EH. Given power costs in the region, it is more likely that lower-efficiency machines are being plugged in. If average efficiency of the fleet is 45J/TH, that's still 11EH.
Discussion
Russian-domiciled hash is highly unlikely to KYC itself and point to Foundry. BitRiver, the largest operator in Russia, is sactioned by the U.S. government.
AntPool has added 26EH in the last 3M, Binance Pool 9.5EH in the last 3M. A large part of this may be new Russian hashrate
Russia now at 1GW: kommersant.ru/doc/5915688
Russia, having 500MW at the end of 2022: https://news.bitcoin.com/russia-expands-its-crypto-mining-capacity-report-reveals/