Russian to English Other Military / Defense air defense (surface-to-air missiles)

Огневые дивизионы зенитных управляемых ракет сторон, в случаях указанных в пункте а) ведут огонь также в догон.

I get the idea here but all military references to this phrase seem to be for fighter aircraft, e.g. "in pursuit". Is there a SAM-specific term for this? (this is from an air defense agreement for neighboring Warsaw Pact countries)