Don't overestimate the effectiveness of a DF-21D to successfully penetrate the defense of a USN CBG. I'm not saying that a DF-21D is a useless weapon, but overcoming USN defense might not be as easy as some people like to believe. And if you don't believe me, I'll prove it to you.
SM-3
View attachment 133170
As you can see in the chart, the USN has already fielded a proven ABM with the block 1A and has started employing the block 1B. These have been tested several times and has successfully intercepted SRBMs and MRBMs with a success rate of 85 percent. The radar used in the intercepts are the AN/SPY-1D(V) with BMD software. By 2020, the US is planning on fielding the block IIB, which will be capable of intercepting ICBMs.
Example:
Anti-Satellite SM-3
AMDR & the Arleigh Burke Flight III
By 2020, the US is scheduled to begin contruction on the newest variant of the Arleigh Burke-class destroyer, the Flight III. It will replace some of the Ticonderoga-class cruisers and will also include the replacement for the SPY-1 radar, AMDR (
Air and
Missile
Defense
Radar). With Improved sensitivity, dual band capability (S and X bands), and lessons learned from AEGIS BMD, AMDR will provide sufficient ballistic missile defense for the US Navy's carrier groups.
View attachment 133207
Example:
Again, I'm not saying that this is an invincible defense system. Every defensive measure has its flaws. But to say that the DF-21D will effortlessly sink every USN ship in the South and East China Seas is a bit rediculous.
Analysis done by me