Yeah, the nutcases pressing Biden to create a "no-fly zone" (ie. shoot down Russian planes, ie. start a war with Russia) are going to end up causing WWIII. They're making me dust off my nuclear-war preparedness plans, find my potassium iodide, etc.
BTW, it's a common misconception that global nuclear war would instantly kill everyone and be the end of the world. If you live more than 10-20km from a major city's center, you'll probably survive the initial blasts. Then if you know how to shelter from the fallout in a basement or something for at least a few days, you'll probably survive the radiation. And then if you don't give up, you and your community should be able to adapt to the climate changes caused by "nuclear winter". If you're not right in the middle of a big obvious target, then you're probably not going to be instantly vaporized, so I recommend making some basic preparations.
Glad someone said it (besides me years ago.)
Anyone who wants to survive can probably do so by hunkering down in a sewer for three weeks or so for the fast-decaying isotopes to dissipate. Anything where there is a lot of overhead cover (like three feet of cement, dirt, whatever.) Also, do what is possible to filter out the air you breath and don't go out to 'check' more often than is necessary because you just track shit back in.
I have enough potassium iodate for my entire small city, but that's back in the U.S. before I expatriated. Speaking of, it's debatable whether adults would even benefit much from the substance, but growing kids are a different story. If it ever comes to it, do prioritize kids for whatever iodine might be kicking around. It's not any magic pill or whatever. Just limits the amount of radioactive iodine which becomes part of one's body, and there will be a lot more pressing problems than that anyway.
That's just my advice for people who didn't get around to looking into things before it became impossible to do.