source is Patrick Lancaster, an American reporter with a Russian wife who received theirs from their kids kindergarten
translation/source at link
just one more sign that were all inching closer and closer to the red line
“Civil Defense
The procedure for the actions of the population on the go signal when at work.
The signal “ATTENTION TO ALL!”
Accompanied by the activation of sirens with intermittent beeps followed by verbal information about the signal GO
* upon hearing the SIGNAL, turn on your radio or television set and listen to the message about the situation and how to proceed
* pass on the information you receive to your neighbors
* Act according to the messages you have been given.
Ways you should notify ALL!!:”
h/t SwampCreature