Nikolay Patrushev noted that it is no secret that merchant ships regularly arrive at Russian ports with magnetic mines attached to their hulls, saying there are reasons to believe that the mines are planted at European ports MOSCOW, June 15. /TASS/. Western countries are working out scenarios where they would pre-emptively attack Russian naval bases, Russian Presidential Aide and Chairman of the Maritime Board Nikolay Patrushev said. "It is important to understand that the West is preparing for