Reports from military personnel stationed at nuclear weapon silos suggest that whatever these are they are able to interfere with the functioning of their silos. Maybe radiation from a plasma could do this but less likely than an intelligently controlled craft.
re: “Reports from military personnel stationed at nuclear weapon silos suggest that whatever these are they are able to interfere with the functioning of their silos. “
Deep underground through reinforced concrete and shielding? I’m going to rate this as hearsay, old wive’s tale, and worse ...