It's easier because it's closer, but it's in an inconvenient "middle" sort of close: distance from mainland is significant.I think countering Japanese intervention would still be better categorized with the overall "Counter Intervention" mission, even though the biggest difference is one of geography and distance. That is to say, I think countering a JSDF intervention would actually be somewhat easier for the PLA given the closer distance of JSDF forces from the Chinese mainland and their land based air and missile forces, relative to countering the US.
Of course, such a great difference in geography and distance for other scenarios would usually be sufficient to be given its own individual geographical theater of conflict, but in the scope of an overall Taiwan contingency, the capabilities and requirements to counter JSDF and US intervention (while being very different in distance and geography) are still fundamentally about air superiority and sea control.
OTOH, for the Taiwan centric mission, it is more comprehensive as it requires air superiority, sea control, SEAD/DEAD, amphibious assault/invasion, ground warfare, potentially urban combat, and follow on resupply as well -- albeit in a much more well defined geographical area than the others.
It's also more difficult because it has a political problem of escalation(do we escalate beyond involved territories), as well as of geography (Ryukyu island chain).
Also, I'd argue that the instantaneous(available on theatre) potential of Japanese forces is pretty comparable to the American one, and it reinforces American capabilities, too.
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Thus, the island of Taiwan, from the Chinese perspective, is an OtH ground to ground amphibious assault, broadly comparable to, say, Sicilian landings. Island campaign with absolute results - because the aim is absolute surrender(annihilation) of the opposing forces and destruction of the Republic of China.
It's a battle in direct view of the Chinese mainland, primarily relying on the escort forces of the navy, army/marines, and [tactical] air power.
Opponent - Taiwanese forces in their entirety. Nothing to add here, good half of this thread is on this topic.
Likely to be one of the largest amphibious invasions in history+significant land campaign.
South-Eastern axis is a pure Mahanian decisive battle - clash of blue water forces, involving land and space elements on both sides. Analogy - great carrier battles of the Pacific. Geographically far from the Asian mainland, cut off by numerous obstacles from direct support(1st Island chain). Curiously - in this particular case, defeat at sea doesn't mean failure of the whole enterprise for China, but defeat, tie or even inconclusive victory does mean exactly that for the US side. This is a huge pressure
Almost pure navy&naval aviation fight, with significant (but secondary!) support from mainland-based recon&strike assets(infrastructure, OtH radars, IRBM force).
Opponent - USN, maybe JMSDF&Australian Royal navy, depending on the political picture; USAF long-range anti-ship assets.
North Eastern axis - while also naval, it's a Corbett-ish -style sea engagement over superior position, with limited goals (for both sides actually). Air-sea-land battle. Analogy - Solomon Islands campaign.
Characterized by intermediate ranges involved(at the outer edge of what tactical airpower can do), beyond any land-to-land amphibious maneuver. Also characterized by the need to somehow deal with these islands - because achieving isolation of Taiwan on this axis will be hard w/o dealing with at least the southern portion of the island chain(and disabling its underwater listening arrays).
This time there is no significant role for army, but all others will be at full play. Traditional grab&hold style naval assault is unlikely, because Japanese ASuW firepower within the reach of its aviation is immense, so time within its range shall be limited. Perfect place for amphibious assault ships to shine, though.
Opponents: all branches of JSDF(sans army heavy units), probably US land-based units, and, importantly, "updated" USMC; RoCAF and ROCN.
Of particular note are JGSDF missile units - since they're, ironically, key battlefield shapers, and it's because of them that we're talking about large-scale amphibious operations.
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