Bluffer’s Guide: Fortress China
By Planeman
7. Taiwan Strait Defenses
China caused quite a commotion by deploying the S-300 PMU-1s across from Taiwan. If they deploy PMU-2 missiles with their 195km range then the whole island will be within PLA SAM coverage.
What’s curious is that there appears to be gaps in the East coast air-defenses. It may be simply that Google Earth has more SAM sites yet to be discovered, but the implication is that China is not so concerned about Taiwanese counter-attacks.

Dianqian has a lot of AAA sites. I’m not sure why to be honest.

Also in the strait, the Taiwanese territory of Matsu Islands is also defended and heavily militarized:

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