A Russian helicopter that went down off the coast of Norway's Svalbard archipelago in the Arctic this week has been found and the eight Russians on board are presumed dead. <br/><br/>The Mil Mi-8 chopper, carrying five crew and three scientists, went missing on Thursday as it was flying to Barentsburg from Pyramiden, a former mining community in Svalbard that is now a tourist site. <br/><br/>It went down two or three kms from Barentsburg, a Russian mining community in the archipelago. <br/><br/>A sea patrol plane, a Danish aircraft, two Norwegian helicopters and several vessels had been searching the area since Thursday.