That's part why them fucking about at Chernobyl was highly concerning.

Nature and soil in that area have absorbed much of the damaging materials, if Russia were to set fire to the forests there, all that would be released and spread across a wide area.

The one thing holding them back is that depending on the wind, this fallout can just as easily contaminate Russia as it can the rest of Europe.

Same with this instance, especially since the nuclear plant is also close to Russia. They may try to disable it to sabotage the electricity, but damaging it in a way that creates fallout will pose as much a risk to their own land as it does to Europe.

And then you realize that Russia doesn't give a shit about its own people or apparently any territory outside Moscow and Saint Petersburg.
And you realize those considerations are rational and Russia and its leadership can't be considered a rational actor at any point anymore.

Depends on how it's done. If they do it the dirty bomb way and winds are unfavorable, sure it could happen, but they'd have to basically set off their own nuke in the plant to make a cloud that would significantly affect anyone outside Ukraine. If they just let it melt down, probably not but it'll wreck the plant and the area immediately nearby.

Still, couldn't hurt to pick up a pack or two of iodine tablets just in case.

No. But it will render the plant inoperable and a mess to clean up.

Yes.

Yes and no. Yes, it could release radioactive particles across western Europe. It would likely also spread fairly quickly around the world depending on the damage and atmospheric conditions.