https://www.newsweek.com/us-russia-emergency-alert-drills-1831776
I think it's unlikely they're going to be broadcasting a 5G kill wave signal, or installing anything on your phone.
Announcing a declaration of full-scale war on the other hand? That actually seems more likely.
Seems a definite convergence is occurring.
I'd say it would take something significant to get us our Twitter message. An incident in Russia/Ukraine involving Americans would certainly suffice.
The ukrainian/american pillow fight being interrupted by russian water balloon terrorists?