You are correct.
China having control over Taiwan would provide Beijing with an undisputable control in the East China Sea, truly breaching the First Island Chain, and allowing PLAN warships and submarines to have unfettered access to the open Pacific.
However, and firstly, consider this map:
View attachment 91708
In particular, take note of the islands of
Yonaguni and
Ishigaki.
Ishigaki Island is a mere 240 kilometers east of Taiwan. Yonaguni Island, meanwhile, is a mere 120 kilometers east of Taiwan.
Next, let me introduce these two planes - Lockheed Martin P-3 Orion and Kawasaki P-1
maritime patrol aircrafts of the JMSDF.
View attachment 91713
JMSDF currently has
68 P-3s and
23 P-1s, whereby the P-1s would gradually replace the P-3s in the JMSDF. And what are these maritime patrol aircrafts are for? Simple - they are meant for patrolling the open ocean, searching for enemy warships, engage in S&R operations, and most importantly -
hunting for enemy submarines.
I highlight the last term in particular is because the JMSDF is merely an extension of the prowess of the USN in the Western Pacific. Furthermore, I think we can all agree that the USN currently is the
best and
most experienced in anti-submarine warfare (
ASW) operations. While I do not know the current capability and sophistication of the PLAN in terms of ASW warfare, but I think that the PLAN still have some room to catch up with their American and Japanese peers.
So why do I brought this up?
It is because both the Ishigaki and Yonaguni Islands
have at least one runway each. And at least the runway on Ishigaki can actually host P-3s and P-1s. Enlongating the runway on Yonaguni in order to host P-3s and P-1s wouldn't be difficult either.
Say, sometime in the future when China is able to reunify Taiwan under direct Beijing control. Consider if both the US and Japan did not get involved in the hypothetical reunification war of Taiwan, which means that the military capability and firepower of the US and Japan in the Western Pacific would not be affected at all, if not increased due to China's stronger presence in the Western Pacific.
Besides, the PLAN would certainly base some of their warships in Taiwan after the reunification of the island is complete. Here's the map of the ROCN bases across Taiwan.
View attachment 91711
Notice that there are two naval bases that are the closest to Ishigaki and Yonaguni -
Suao and
Keelung. In fact, Keelung is at present
the largest ROCN naval base in Taiwan. Therefore, it is safe to assume that the heavier and more powerful PLAN warships would be stationed there.
Coincidentally speaking, those two PLAN bases would also be
very exposed to reconnaisance and monitoring operations of the JMSDF based from Ishigaki and Yonaguni, if not the USN from Naha. The JMSDF P-3s and P-1s can very easily fly around the eastern and northern coastlines of Taiwan, meaning that any movements by the PLAN would be tracked and followed by the JMSDF and USN, just like in the one map (out of many) below.
View attachment 91712
By having Ishigaki and Yonaguni located closer to PLAN bases in Taiwan would also significantly reduces the flight time spent by JMSDF and USN maritime patrol aircrafts flying to and from their bases and the designated patrol areas, meaning that there would be
more time for them to loiter around plus
monitoring and hunting PLAN warships operating from their bases in northern and eastern Taiwan.
Furthermore, the reason why I highlighted the term ASW above - is mainly because China has the
Jianggezhuang Naval Base located in
Qingdao, which is
one of the only two PLAN naval bases that are
hosting nuclear-powered ballistic missile submarines (SSBNs).
In order for the PLAN SSBN and SSNs based in Qingdao to access the open Pacific, the shortest route would be to cross the
Miyako Strait, which is sandwiched between the
Okinawa and
Miyako Islands to the north and south. Needless to say, the US and Japan certainly will conduct intensive maritime patrols along the strait, especially if the geopolitical situation in the Western Pacific becomes even tenser than it is now.
Such scenario signficantly raises the possibility for any of the Qingdao-based
094s, 094As and 096s to be detected once they cross the Miyako Strait. And once any of those subs are detected, it would not be difficult to follow and keep track of them by maritime patrol and ASW units. In case a major hostility between China and the US breaks out, the first priority for the JMSDF and USN would be to hunt down theose PLAN SSBNs and sink them ASAP before those SSBNs could launch their nuclear-tipped SLBMs against the continental US.
Moreover, the PLAN SSNs based in Qingdao, i.e.
093s, 093As and 095s would also have to access the open Pacific in order to effectively interdict and intercept warships and military convoys that are coming from Japan, Guam, Hawaii and the continental US to relief and support their forces that are fighting in the Western Pacific, thanks to their unlimited range compared to conventionally-powered submarines. Similarly, going through the Miyako Strait would also have the same implications as described just above.
And how is this related to the Philippines?
Take a look at this map.
View attachment 91714
That's right - the
Luzon Strait, sandwiched between
Taiwan and the
Luzon Island of the Philippines to the north and south.
So why did I believe that apart from focusing on Taiwan, China would need to get the Philippines as close to China's side as best as possible?
Because securing the Luzon Strait is
very crucial for safeguarding the passage of the PLAN SSBNs and SSNs from the China Seas into the Philippine Sea, and hence, the open Pacific.
Please refer to the illustrated map below:
View attachment 91722
In the
north:
The
Miyako and
Tsushima Straits can be easily blocked off by the
USN,
JMSDF and
ROKN.
In the
south:
1. The
Sulu Sea and its
respective straits are not just further away from both Jianggezhuang and Qingdao, but it also has more islands and islets that would increase the risks of underwater collisions like what happened to USS Connecticut last October;
2. Australia with their
RAN warships and ASW units would also be close by to block it as well; and
3. Sailing SSBNs and SSNs through the South China Sea would risk violating the
ZOPFAN and
SEANWFZ of ASEAN, risking disapproval from fellow ASEAN members that borders the South China Sea, which could work against China when dealing with the South China Sea disputes later on.
(both of the routes are marked in red arrows and red crosses)
That leaves only the
Luzon Strait as the safest and most secure route for not just PLAN warships, but also their SSBNs and SSNs to access the open Pacific from the China Seas. This would
significantly alter the balance of power in the Western Pacific, because the PLAN could easily sail around the Pacific Ocean, challenge the hegemonic presence of the USN head on, and not being constrained by the narrows of the First Island Chain. (route marked by green arrows and green ticks)
Securing the Luzon Strait would also provide a
blind spot for the PLAN to sneak their SSBNs and SSNs into the open Pacific, as any ASW units of the JMSDF, USN and RAN would have to fly further away from their air bases to reach their designated patrol areas, therefore reducing the amount of time that could be spent patrolling the area and hunting for PLAN nuclear-powered submarines entering the open Pacific.
All of these - while also avoiding the risk of violating the ZOPFAN and SEANWFZ of ASEAN.
Furthermore, if China is capable of making the Philippines into one of her closest security partners in the Western Pacific, the possibility of the Philippines
hosting USN and RAN units (ASW in particular) can also be
significantly reduced, thus providing China a larger space to breathe for her PLAN warships and nuclear-powered submarine to access the open Pacific freely and without restriction.
And personally, I believe that this is very crucial for not just
securing China's own future in the Pacific Theater, but also working towards
gradually pushing the US back to the Eastern Pacific - Militarily, influence, or both.