Doesn’t look like a nuke at all. A big nuke should give a flash, then dim, then brighten to nearly blinding intensity, then die out slowly. This brightens and then fades one time, over a fairly short period of time. Meteor or similar space junk.
I agree. This event was far too short-lived to be a nuclear weapon. The fireball would last for minutes.
Like this?
Это что вообще было?" Огненная вспышка в небе над Свердловской областью