Let's not include Sabah in this matter :P Sabah is a totally different case than Spratley Islands.
Differences
Sabah claim by the Philippines is historical and a historical fact, even the United Kingdom admitted and re-confirmed that Sabah is rightfully owned by the Sultan of Sulu, which is by today's Philippine constitution goes to the Philippines itself (with the Sultan of Sulu having a jurisdiction).
Sabah claim by the Federation of Malaysia is about the plebiscite Sabah did if they will join the Federation of Malaysia (which is still to be founded) or not. Majority voted to join the soon-to-be Federation of Malaysia.
United Nations stand... both countries must file a formal complaint to the ICJ (International Court of Justice) and let the ICJ decide. Until not, nothing happened.
ASEAN Decision? Non-Interference as usual, let them have a war, the other ASEANs will not interfere (kinda stupid).
Spratley claims on the other hand are based on the UN Law on Maritime Territories. I do not know the details already but as per that UN Law, there is a certain nautical miles borders of countries stretches to the open sea. Spratley Islands happens to fall into the territories of the following:
China
Philippines
Taiwan
Viet Nam
Malaysia
And because Spratley have oil reserves, everyone suddenly wants a piece of it. The countries that are very active with their claims in the following order:
1) Philippines
2) China
3) Viet Nam
Now there's a problem. Philippines and China are getting closer and closer every quarter (the NBN fiasco is not even a reason for the two countries to separate ways). China and Viet Nam are of course close together (China influenced and introduced Communism in North Viet Nam during the Viet Nam war and won). Viet Nam and Philippines are both members of the ASEAN and ever since have been close friends (Viet Nam war; Viet Nam refugees; etc.)
Malaysia is not that active because they have a Sabah issue to concentrate on. If the Philippines won over Sabah (and we are getting closer to achieving that - hence support the dam* charter change to solidify our stand), Malaysia will lose oil and a portion of its National GDP. BUT I DOUBT the United Nations will allow that since there will be mass exodus if that happens. So in the end, Malaysia will be obliged to pay the Philippines and the Sultan of Sulu all payments due to us, starting from centuries ago to the present with the appropriate currency fluctuation adjustments.
Of course Malaysia will not accept that. In the end, by the time this Sabah issue is settled, I'm sure ASEAN already achieved "Union" status similar to the European Union, African Union, and the South American Union.
IF not, I'm sure the ASEAN already have a One Visa policy and/or an Open-Border policy within Asean members. PLUS, our economies by that time would have been surely integrated already (though still have different currencies probably). So by then, no one cares if Sabah is under the Philippines or Malaysia because any Asean Citizen can go there anytime s/he wants to :p
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