For what purpose? Ukraine who supposedly has no nukes, drops it and opens the door to all out Russian invasion of everything including Kiev. No way the west would back them up after a first use for a trival reason.
And the Russians? Why would they drop on a city their side controls?
Just looks like a big battlefield explosion. They do happen. Look the Marines at Roi-Namur. A grunt threw a satchel charge into a concrete building. Turned out to be a very large storage site for torpedo warheads. The photos look like the whole island went up in one blast.
The incident at Kamisayah during the Gulf War (1991) was another example of unintended consequences. Although the explosion was planned the results were not. Saddam did not color code his munitions. Military stacked them all together and blew them in place. Did resulting blast (HUGE!) cause “Gulf War Syndrome?” No way to know...