The King's words give you an indication of the problem. But they are bound by the problems they have with Burma. That is a no-win situation. The Burmese military is not about to do that. So we have a stalemate.
Japanese policy is split.
I spent a week in Tokyo recently talking with Japanese ministries, think tanks and so on, and it is very clear that Japanese foreign aid is being withheld because the Foreign Ministry is concerned about US reactions. It is said to be humanitarian because people will be killed if the airport is not fixed. In 1979, I negotiated the re-entry of the USA aid program into Burma with the Burmese Deputy Prime Minister. The first thing they asked was that the Rangoon airport be repaired. But I said that this was not related to basic human needs and that the US would not approve of such a plan.