Legal treaties, or any kind of contract really, are only worth their paper as long as there is an underlying system with power to enforce them. I believe these nations have no standing in international courts; they have no armies, allies or resources. Upholding these treaties is entirely dependent on goodwill.

If Canada was to ignore them and take over all land, who would stop them? It is, in the end, Canada being nice. Is that such a terrible thing?