LKJ86
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No No NoTo replace? I thought HQ-9 is for that.
S-300/400 are very different from HQ-9.
S-300/400 have several kinds of missiles, while HQ-9 just one.
S-400 used to be called S-300PMU3, but has a new big missile 40N6 to reach the so-called range of 400km.
So, China just uses S-400 to upgrade the older S-300.