WTF??Well the problem is if you attack a nuclear country there is a possibility of setting off all of their bombs, missiles, or nuclear power plants.
Nuclear weapons are NOT fratricidal, you cannot "set off " a nuclear plant as a nuclear plant isnt a fission device....where the HELL did you get this from?
Why did Chernobyl happen? Because the Russian techs deactivated the safety systems that would have prevented it.Are you not old enough to remember Chernobyl? If so here is something for you to read https://en.wikipedia.org/wiki/Chernobyl_disaster
The event occurred during a late-night safety test which simulated a station blackout power-failure and in which safety systems were deliberately turned off.