From: Arnhem (holland) yes a bridge to far...
HARM like missiles are good for taking out single radars, but they can only damage a single radar per hit. For destroying multiradar SAM sites like the S400 I usually use a few AGM-154A JSOW's with cluster warheads as even one hit can destroy the entire site, so even if you fire 10 of these and even only one gets through, it's most likely lights out for the SAM system.
So coordinate your attacks with in-line jammer support at 30 to 40 miles, ten or so HARM missiles, and five to ten AGM-154A's and the S400 is history.
In vinum illic est sapientia , in matera illic est vires , in aqua illic es bacteria.
In wine there is wisdom, in beer there is strength, in water there are bacteria.