This article is one in the set of publications about the different types of procedural estoppels used in the Russian judicial practice. The main goal was the estimation of the positive potential, which the doctrine of estoppel might have for the development of the Russian Law of Civil Procedure. It is postulated that the wide application of estoppel against the late presentation of procedural materials discovers, that the normative framework of the Russian Law of Civil Procedure does not sufficiently provide the principle of procedural concentration (the general idea about the duty of the parties to present all means of attack and defense on the early stages of litigation). Based on the comparative analysis (USA, Germany) the authors state that this problem might be cured by the more vigorous implementation of the stage-preclusion principle in the Russian Law of Civil Procedure.