But does Indonesia even need larger ships than frigates?
The only ship class that Indonesia doesn't need is an aircraft carrier (but only because it needs airfields anyway). Even LHDs will be necessary in time.
Just look at the sheer size of it.
And complexity:
Java - 149 mil., Sumatra - 59 mil., Sulawesi (Celebes) - 20 mil., Kalimantan (Borneo) - 17 mil, West Papua - 5,5 mil. All of Indonesia has approx 278 mil.
It's easy to imagine where the main threat requiring naval presence is located and which countries will be the threat vector.
A map I made a few years ago to demonstrate aerial theater in the region. It doesn't show ranges for naval SAMs but those can be inferred. There's an outline of Poland in the Timor Sea for reference and better understanding of scale.
There are only two viable sources of tested and future-proof AA naval assets:
- US and AEGIS which could be implemented in e.g. Korea or Spain
- China.
If Indonesia was looking to develop dependency on the US it would have not chosen Rafale for its air force or the British/Danish Arrowhead 140/Iver Huitfeldt class for new frigate. European designs use either American Standard + ESSM missiles with either AEGIS or Thales APAR or they are based on French/Italian/British Aster 15/30 +Mica/SeaCeptor. The latter is in low rate production and it would increase dependency on France. Korea would be a good choice for cooperation but they have no viable AA system of their own.
An air warfare destroyer is a must for Indonesia because it currrently has no ships with SAM better than Mica VL and it needs to protect LPDs of which it has seven already. With lack of infrastructure in the region ships are the only viable AA.
Considering that the main threat will come from F-35s a Chinese AA ship might not be a bad idea. Keeps the fleet diverse but viable. Makes sense militarily but it's ultimately a political decision. Buying a Chinese destroyer would be seen in DC as a clear signal and Jakarta may or may not want to send it, at least not yet. I don't know the internal politics enough to say more.
The unfortunate problem of Indonesia's geography is that China doesn't need to violate Indonesian space but US doesn't have a choice. Buying Chinese AA ships may be a solution and a signal in one direction but it will mean bad terms with DC immediately. But the US is only responsible for 10% of exports and 5% of imports so it may be a worthwhile tradeoff if China can compensate the loss - which in economic terms it can.
052C could be a testing of the waters/boiling the frog as they are not the most modern assets but will be essential to transition the crews to Chinese tech. With 052C in service any future acquisition of 052D/newer is much easier. Similarly an upgrade of 052C will be possible quickly judging by the speed of refits/upgrades of other older PLAN destroyers. Not to mention that with 052C already in service Indonesia can easily open itself to Chinese military aid should it feel threatened. Military equipment is all about the procedures and knowledge base necessary to use and maintain it. Ukraine demonstrated it very well - older Soviet tech was more useful than newer NATO tech because it could be implemented quickly. So it's an option that Indonesia may want to keep open.
Everyone looks at Taiwan or SCS but to me Indonesia is the most important factor because of how it legitimises foreign intervention in a neutral territory (see: East TImor) meaning that it allows a proxy conflict for all involved which is something that is no longer possible in SCS/ECS etc and draws China away from its prepared positions. If you're losing one game, start a new one.
I'll stop here as this shouldn't develop further into OT but this development is certainly worth the attention. Game-changing if true, and interesting either way.