NOT a nuke.
It is now confirmed to be a Tochka/SS-21 ballistic missile with an HE warhead.
2nd pic is of sunrise, taken from a satellite, a few years ago.
“Confirmed”. LOL.
Among all the artillery being lobbed that night it’s plausible that an SS21 was included.
But the explosion as seen on video was a secondary. No way that tiny missile was responsible for a primary blast of that magnitude.