Must be

• multiple countries from the Arab League or the peninsula

• not already in major active conflict with Israel (i.e. this precludes only Palestine)

• using official forces or forces acting with official permission

• working together (can join other Arab states other than Palestine already in conflict to qualify)

• either attacking first, or attacking after Israel pre-emptively strikes against any gathering of forces (if Israel instead attacks, say, primarily civilian targets, then Israel is the aggressor against that country for the purposes of this question)

(feel free to suggest more criteria if this doesn't feel sufficiently clear. will lean on spirit of the question in the meantime, and in general)