Ukraine no fly zone for nuclear plants?

I understand the reason for not having no fly zones in Ukraine. They would involve the US or NATO in direct war with Russia because enforcement would mean bringing down Russian planes and escalating the war beyond Ukraine. But, we can provide humanitarian aid in getting sick and wounded Ukranians out of the country for treatment to lessen the death toll. And private individuals can volunteer to fight in Ukraine.

But, after the Russian attack on a nuclear plant that nearly became a nuclear disaster that for rest of Europe, are we justified in providing air cover for Ukraine's nuclear power plants?

One objection is possible "mission drift" to other areas of Ukraine. But can we, or should we take the risk of another nuclear power plant disaster since either the Russian military is inept at best, or, at worst, they are instructed to do nuclear damage?