Contrary to what we're all supposed to believe, since Hiroshima and Nagasaki (which were fake) there have been many, many dozens of tactical nuclear strikes (which were all too real).
There was just another tactical nuclear strike using two weapons on unknown targets. The video is not dated but the news broke today. I have never seen this particular strike before and I have seen video of quite a number of them, so I'm going on the assumption it's new and would have been taken the night of February 15-16
The video was originally posted to TikTok but I don't have the link. Here's the link to a slightly downrezzed version on YT (which you should consider saving): WTF, IS THIS REAL?!?!?
I can assure you it is real. In fact, you can see the towering mushroom cloud of the preceding strike. No one seems to know where this was, but someone on the video speaks a word which is said to be Russian.
These are without doubt nuclear detonations, if you have never seen one on a battlefield. Look how it completely lights up the sky and the landscape for several seconds, and very dark night falls thereafter. It's very hard to tell, but I would eyeball the yield at 10-15 kT.
All of this is being very heavily suppressed.
UPDATE 2/17: I've located one writeup of this event on alt-media: Nuclear war but not in Ukraine
Just an explosion of gas/oil/kerosene. You could easily do similar mushroom clouded blast using a standard 200 liter barrel with top cutted out and little gasoline. Be careful, it could be violent over the top.
Mushroom cloud in no case nuclear blast specific.
Brighness change is just a shitty mobile automatic exposure control.
PS: There is a special and very painful place in a hell for those who shoot vertical videos.