I will give you one example. Shipping Routes.
A lot of Australia's shipping routes pass through Indonesian Waters. So if Australia was to abandon there co-operation with Indonesia and Indonesia was to say, "ok then, no more of your trading ships can pass through our waters", it would be a logistical nightmare for Australia. Now im not saying Australia would be brought to their knees, but it would significantly effect trading ships coming to and from Australia.
Everyone has an opinion and that should be respected. In mine I try to use (IMO) so that readers understand it is just that. However, where possible, backing an opinion with some reference gives said opinion greater weight.
i.e. Shipping routes
Maritime law is very old and 'Freedom of the Seas' is well documented. The more recent 'UN Convention of the Law of the Sea' covers who and what can traverse Territorial Waters. It is a boring subject but Article 17 lays out the 'Right of Innocent Passage'.
Link:-
UNITED NATIONS CONVENTION ON THE LAW OF THE SEA
If Indonesia, or any country, unilaterally denies such passage it can trigger a state of war....which has occurred in the past.