The Government of Burma/Myanmar is clearly not exercising its responsibility to protect its population, because it is blocking international aid effort.
I would say that if physically possible, the aid should go in anyway, regardless of the Junta's "permission", on the grounds that humanitarian effort takes precedence over legal niceties. The UN can argue about the details afterwards. This action would be in the spirit of, if not in line with the letter of, the Responsibility to Protect (R2P) doctrine.
This is a case of human need rightly overruling the sovereignty of undemocratic regimes.
Maybe Dam Aung Sang Suu Kyi (?sp.) should be invited to oversee the aid effort.