In the Russian Federation, as in a number of other economically developed countries, there are legal restrictions on the admission of foreign investors to participate in commercial corporate organizations of strategic importance for national defence and state security. Failure by foreign investors to comply with this mechanism leads to the nullity of transactions and, as a consequence, to legal disputes, the subject of which are mainly restitution claims. There have been numerous problems and academic debates in recent court practice regarding the reasons and the possibility of satisfying such claims. In particular, in view of the changed circumstances after the conclusion of the contested transaction, the real public interest is not always visible pursued by the claim for application of consequences of its invalidity. The author proposes that in the course of judicial proceedings in such cases, when the defendant raises the relevant reasoned objections, not only to state the fact of violation of the law by a foreign investor, but also to reveal the public interest defended by the foreign investor. The author proposes that, in such cases, the defendant’s arguments should not be limited to stating that the foreign investor has breached the law. If one is not established, a claim may be dismissed under certain conditions, taking into account established doctrinal approaches to the understanding of the right of action.