Where Were the Russians?

According to the plans wn up at the start of the war, 38 thousand russian troops were due to arrive any day now. The hopsburg forces around olm were now surrounded on three sides and cut off from re supply and reinforcement. This begs the question, where were the russians? General mock had expected to hold this position temporarily while he awaited the arrival of his allies. He seems to have been psychologically incapable of contemplating the possibility that his plan had failed. And he had been tricked.