The strongest of the four is Norway. However, there are guidelines that were put together by the Arctic Council and published last year, and none of the countries actually meet the standards set by the Arctic Council. Canada's regulation is among the weakest; Norway's is the strongest.
I would suggest that Norway would likely be a case example to follow, but we need to set the bar higher, given the possibility of a disaster in the Arctic and the implications of the disaster. We need to set the bar higher.