How to block this threat?

[gaia]

Even if just for the fact that it spiked up resource usage to the point that I got an alert, I would like to stop these attacks:

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HEAD /?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 HTTP/1.1" 200 - "-" "-"

It would be trivial if they weren't coming from the most diverse networks in China. Unfortunately, I cannot block China entirely.

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121.40.159.147
72.16.148.41
61.165.96.176
60.214.72.225
60.209.94.105
59.55.251.202
59.41.252.226
222.67.78.111
222.209.110.34
210.22.167.30
183.37.150.174
183.224.98.116
182.50.113.58
171.12.6.156
14.147.24.7
124.207.227.146
119.129.195.7
118.122.122.213
118.122.118.29
118.113.162.24
116.66.38.138
115.155.97.193
114.247.50.2
113.110.70.47
106.117.84.98