Defending Leh airport would need at least 4 battalions of S-400 SAM against 2 battalions of PHL-03 with with 144 long range rockets, firing all within 5 minutes.
Limited stock of imported S-400 missiles against unlimited supply of Chinese domestic production rockets means Indians SAM defence will run out of missiles while the Chinese could continue to bombard the airport for hours until kingdom come.
Leh airport is located at less than 90 km from the nearest LAC and is within range of Chinese rockets, rocket assisted 155mm artillery shells, air to ground missiles and air launched stand off glide bombs. Leh airport is simply too close to LAC and is extremely vulnerable.
The longest range Chinese rocket is the 400mm WS3 with range of 480km.
PHL-03 300mm guided rockets is said to have a range of 160 km.
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