A foreign goverment attacking another countries diplomats with a weapon that causes injury (possibly permanent brain damage) would be considered an act of war. I suspect the injuries from the "sonic attacks" are incidental and unintended side effects at using very powerful ultrasonic or infrasonic emitters, possibly in a phased array, for some type of espionage purposes. The experiences as described by the victims seem to match what might be expected from ultrasonic standing waves caused by signals from a powerful emitter, constructively interfereing with its reflections from nearby objects: hooktube.com/watch?v=XpNbyfxxkWE
Ultrasonic espionage technology can exfiltrate useful intelligence using conductive emission via pathways that are otherwise shielded at secure facilities.
The Great Seal bug was a passive device that required enormous amounts of RF power to be "beamed" into the study of the American Ambassador to produce a useful return signal from the timy antenna concealed on the Great Seal. Had the Sovients chosen RF frequencies that are stronly absorbed by human tissues, anyone in the Ambassador's study would be at serious risk of RF radiation injury, likely to include permanent eye injury. Great Seal Bug: hooktube.com/watch?v=srEVaA36OJk
The NSA retroreflector espionage technology also requires stimulation from very strong RF signal in order to generate a useful return.
If someone tried to use ultrasonic technology to a.) map the inside of the rooms: hooktube.com/watch?v=fGZzNZnYIHo or b.) to exfiltrate voice or elint, analogous to the Great Seal Bug: hooktube.com/watch?v=srEVaA36OJk or NSA retroreflectors: hooktube.com/watch?v=a4_PvN_A1ts respectively, they might try using an ultrasonic version of L.R.A.D: hooktube.com/watch?v=3sxFiq46Jog that uses Phased Array Emitters: hooktube.com/watch?v=vtPPAnvJS6c
If someone wanted to permanently injure someone in the Oval Office, a phased array version of an ultrasonic L.R.A.D would have the capability of creating permanent, irreversable brain injury that would be very difficult or possibly impossible to attribute to an external source: hooktube.com/watch?v=GyT1dsY0KtA
Most smartphones and tablets have microphones whose frequency ranges extends both above and below the normal range most humans can hear and there are a number of apps available to detect, log and record these sound frequencies:
Free* (No Money, No Ads) Google Play Ultrasound Detector App
https:// play.google.com/store/apps/details?id=com.microcadsystems.serge.ultrasounddetector
Free* (No Money, No Ads) Google Play INFRAsound Detector App
https:// play.google.com/store/apps/details?id=com.microcadsystems.serge.infrasounddetector
*Warning, possible Russian influence, software author's name is Sergio Gudkov ;-)
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