LOL. You are talking about the same Japan that Chinese subs penetrate with impunity?
You are talking about the same USN that always seems to have a "shadow" whenever a ship goes into the Asian littorals?
They can do ASW if they have no time constraints..... but by that time, the army has already landed and are heading for the capital!
The same Japan that detected, tracked and hounded a Chinese submarine out of what they claim as their waters... for which the Chinese apologized for.
China is extremely adept at diesel sub ambushes. They're not afraid of flaunting this either. Nothing frustrates an adversary's plans more than diesel subs.
In the areas that the Americans will likely place a CVBG, diesel subs won't be an effective tool; I will expect the Americans will place their CVBG on the east side of Taiwan in the Philippine Sea. On the east side of Taiwan, it is open ocean.
And how will you get air superiority when China has overwhelming numbers of advanced aircraft in the theater? When it has overwhelming supply ability? When it has advanced support assets like AWACS and ground radars?
The American's don't need to sail down the Taiwan Strait do protect Taiwan. They can do so from the other side of Taiwan.
Furthermore, the ability of the Chinese to maintain high-tempo operations for long periods of time is questionable. The airspace over Taiwan is also limited; no more than 200 aircraft can fit in the airspace before it becomes way too crowded.
Unless the Chinese wished to leave the rest of their borders undefended, the Chinese lack the aircraft to overwhelm the Americans. Furthermore, the maximum amount of aircraft is limited to the capacity of the various airfields on the coast.
With the Type 022 and the Yuans, the US cannot try to cripple the coastal bases and land bases with a massive initial barrage of cruise missiles. Therefore, it will have to go head to head with the full mass of the PLAAF and PLAN. Based on the assets it could conceivably bring into the theater, that's a losing game now and it's becoming even worse with time.
I've already crunched the numbers using Harpoon 3 ANW. Unless the Chinese have a 5:1 advantage in fighters, a 5:1 advantage in bombers, and a 2:1 advantage in large, modern warships; they will not be able to inflict significant damage to a single CVBG. In fact, if they were to clash NOW; the Chinese air force would be non-existent after day 8, and the navy would be already be gone by day 6 of active fighting, using USN ships based in Japan:
U.S. Fleet Activities Yokosuka, Japan
USS George Washington (CVN-73)
USS Blue Ridge (LCC-19)
USS Cowpens (CG-63)
USS Shiloh (CG-67)
USS Curtis Wilbur (DDG-54)
USS John S. McCain (DDG-56)
USS Fitzgerald (DDG-62)
USS Stethem (DDG-63)
USS Lassen (DDG-82)
USS McCampbell (DDG-85)
USS Mustin (DDG-89)
U.S. Fleet Activities Sasebo, Japan
USS Essex (LHD-2)
USS Denver (LPD-9)
USS Harpers Ferry (LSD-49)
USS Tortuga (LSD-46)
USS Guardian (MCM-5)
USS Patriot (MCM-7)
USS Safeguard (ARS-50)
Apra Harbor, Guam
USS Frank Cable (AS-40)
USS City of Corpus Christi (SSN-705)
USS Houston (SSN-713)
USS Buffalo (SSN-715)
The USN can also rush other assets into the region within a week's time, these include the Nimitz CVBG, comprised of the following ships:
USS Nimitz (CVN-68)
USS Princeton (CG-59)
USS John Paul Jones (DDG-53)
USS Higgins (DDG-76)
USS Chafee (DDG-90)
Also, the Lincoln battle group is also available:
USS Abraham Lincoln (CVN-72)
USS Mobile Bay (CG-53)
USS Shoup (DDG-86)
USS Monsen (DDG-92)
USS Rodney M. Davis (FFG-60)
USS Ingraham (FFG-61)
USS Ford (FFG-54)
USS Curtis (FFG-38)
On top of that, the Stennis is also based in the Western Pacific:
USS John C. Stennis (CVN-74)
USS Antietam (CG-54)
USS O'Kane (DDG-77)
USS Halsey (DDG-97)
USS Howard (DDG-83)
USS Jarrett (FFG-33)
USS Preble (DDG-88)
USS Rentz (FFG-46)
The USN also has warships based in Pearl Harbor; these include:
USS Russell (DDG-59)
USS Paul Hamilton (DDG-60)
USS Hopper (DDG-70)
USS Chung-Hoon (DDG-93)
USS Chosin (CG-65)
USS Lake Erie (CG-70)
USS Port Royal (CG-73)
USS Crommelin (FFG-37)
USS Reuben James (FFG-57)
USS Los Angeles (SSN-688)
USS Bremerton (SSN-698)
USS La Jolla (SSN-701)
USS Olympia (SSN-717)
USS Chicago (SSN-721)
USS Key West (SSN-722)
USS Louisville (SSN-724)
USS Pasadena (SSN-752)
USS Columbus (SSN-762)
USS Santa Fe (SSN-763)
USS Charlotte (SSN-766)
USS Tucson (SSN-770)
USS Columbia (SSN-771)
USS Greeneville (SSN-772)
USS Cheyenne (SSN-773)
That's a significant amount of firepower that can be brought against China within a week's time. If you include the units of the Japanese Navy and even the ROC Navy, it grows even more.