At such a long distance, even though anti-ship missiles and cruise missiles can fly close to the sea, the radars are deployed at the mountain peaks of the Andaman Islands. With so many missiles attacking, the time is long, it's unlikely that there wouldn't be any traces detected.
If they had detected earlier and the base had made preparations in advance, the losses wouldn't have been so severe, the Far East Fleet wouldn't have been entirely wiped out.
Only sea-based missiles launched from nearby warships, within too close proximity, gave the radar insufficient time to react, making this a reasonable speculation for the attack.
"Warships, does Jieke Group have such advanced warships? The document just mentioned that there were as many as 200 incoming missiles, how many destroyers must it take to launch that many?"