A court might not give him everything that he's asking for, but this situation isn't exactly like a EULA. Those are contracts of adhesion: drafted entirely by one party and offered on a take-it-or-leave-it basis to a (generally) less-sophisticated party. Courts have special rules about construing provisions in those situations, but such rules wouldn't necessarily apply here (since the contractual language was the product of joint drafting). Of course, I'm not a Russian lawyer, so my 2 cents are probably worth more like 2 rubles....