Russia already directly deals with Central Asian nations through CSTO. They do not even like SCO's foray into their sphere of influence so the less said about Pakistan here the better.
Russia is already directly dealing with Israel, Turkiye, Iran, Syria, Saudi Arabia, Egypt, Indonesia and Malaysia. What can Pakistan offer with regards to the Islamic world and/or middle east?
Pakistan's nukes are useless for Russia.
It does not serve interests of Russia to prop up Pakistan against India or Iran.
Russia is already directly dealing with China. So Pakistan's help is of no use.
The only place Russia needs Pakistan is in Afghanistan to prop up Taliban against the ISAF forces. This is where China and Russia may need Pakistan's help. This is what was discussed during Russia-China-Pakistan Trilateral meeting on Afghanistan.
Let's see how this goes..
as a weapons exporter and major producer of energy Russia deals with most Muslim countries. Pakistan is the one of the Muslim countries with whom they have the minimum contact