From formal point of view Russian navy has right to attack and sink Norwegian warships. http://www.aftenposten.no/english/local/article1136441.ece At this point I strongly doubt that Nowegians have right to use force in Russian economical zone. Suppose that Norwegian bordergurds would try to detain someone on Russian side of the border. Whatever 'someone' did the borderguards could be lawfully killed by Russian borderguards. However http://www.mosnews.com/news/2005/10/17/elektron.shtml According to international law Norwegians have only one option: ask Russian authorities to detain and check the trawler. Now imagine for a second that reaction of Russian navy would not be so calm.