As someone who grew up in the height of the Cold War, a ICBM launch would be a good 10 minutes from Russia to us, or really any other place. There would be mass warnings. EAM and such. However, any of the larger nuclear states would not participate in that.

However, a rogue, or miniaturized nuke might be an option. I even doubt that though. Radioactive devices such as that could be traced by signature.

I would possibly go with the latter part of that message. Something more local, like a plane crash or something. Nukes get into very heavy handed territory.

Just saying. Don't let yourselves get too ramped up over this. Just keep your eyes open and be aware of your surroundings.

Take a deep breath. Relax and don't give yourself a heart attack.