Ukrainian media:
Kyiv - nuclear danger! Do not go out into the street - this is the first time this warning has been issued.
️Everyone must now be in safe places, please stay tuned for updates, as the main app is down. We will inform you in real time about threats, missile launches and their trends. If S-400 or Iskander missiles are launched, the alarm on the phone may not go off.
Nationwide alert. The notification app may have been hacked.
Telegram sources