You can say Japan is blameless all you want - I still disagree. Given that the PRC was excluded from the UN until the 1970s (largely by the US and West), they had no method to dispute the terms of the agreement which kept those islands nominally Japanese.
That's why there is a dispute - had they been at the table in 1951, maybe this mess could have been avoided...
As for China, I'm not too worried. It desperately wants to get on the Arctic Council to get a voice in the region and to do so it must recognize the sovereignty of the members of the Council (of which Canada is);
$1:
The Council was set up in 1996 and has eight members viz. U.S., Canada, Russia, Norway, Denmark, Sweden, Finland and Iceland. There are five permanent observers viz. the U.K., France, the Netherlands, Poland and Italy. Brazil, China, Japan and South Korea have also expressed an interest in becoming permanent members. However, it should be noted that a condition for being granted this status is acceptance of the sovereign rights of the Arctic Council members over the Arctic Ocean.
http://www.thehindu.com/opinion/op-ed/a ... 848280.ece