MOSCOW   The Russian Navy will thwart any attempt by the West to impose a naval blockade on the country, a senior official said Tuesday. In an interview with the Russian newspaper Argumenty i Fakty, Russian Presidential Aide and Chairman of the Maritime Board Nikolay Patrushev described the recent detention of Russian oil tankers as "piratical, in essence, attacks." On Jan. 22, the French Navy intercepted and detained the oil tanker Grinch in the Western Mediterranean, which was traveling from