Weimar Germany and the USSR were developing such a relationship, albeit more out of necessity and lack of alternatives than love or mutual interest. So keeping Weimar alive longer could go that way, if the French maintain their "isolate Germany" policy, though this less thanmore likely.
Pre WWI Germany and Russia did not have many colliding intrests, and most of their differences regarded the Balkans/Turkey. If Germany was to change its foreign policy by sticking to Bismarck's ideas of "nothing to do in the Balkans, and make a good deal with Russia", I could see the two becoming allies. Maybe if Austro-Hungary reformed in some manner that no longer made it a suitable ally for Germany (Franz Josef dying earlier, A-H federalising) you could see Russo-German alliance against a Franco-Austria Entente.