What betrayal? Russia literally to this day provides advanced weapons and technical knowhow to India.
Pakistan and Russia were never friends, and any deal signed was based upon gaining maximum benefits while maintaining healthy political distance.
Let's also not forget that the ONLY reason why Russia even considers selling weapons to Pakistan is for putting pressure on India about its close relationship with the USA.
After selling a few helicopters to Pakistan, the Russians have refused to sell anything advanced to Pakistan since then.
Besides, what's Russia gonna do? Stop giving gas to Pakistan which it already doesn't do?
Russia can't do shit about CPEC, as it's a vital part of China's near abroad economic/military policy. The Russians have no say in it. If anything, the Chinese will tell the Russians to shut up and go back to losing in Ukraine.