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.
The North Korean crew on one of the boats reportedly attacked Russian agents when caught, injuring three Russians.
The boats and crew were taken to Russia's Nakhodka Port.
Moscow's foreign ministry summoned North Korea's ambassador to Russia and expressed grave concerns.
North Korean fishing boats have been seized many times by Russia for illegal fishing in Russian waters.