Russia has seized two North Korean fishing boats and 80 crew members that were illegally fishing in Russian waters, according to Moscow's Federal Security Service on Tuesday.<br />The North Korean crew on one of the boats reportedly attacked Russian agents when caught, injuring three Russians.<br />The boats and crew were taken to Russia's Nakhodka Port.<br />Moscow's foreign ministry summoned North Korea's ambassador to Russia and expressed grave concerns.<br />North Korean fishing boats have been seized many times by Russia for illegal fishing in Russian waters.<br />