This is the best summary I could come up with:

Air defense experts say missiles like the one that hit the market can go off course for a variety of reasons, including an electronic malfunction or a guidance fin that is damaged or sheared off at the time of launch.

Russian forces shelled Kostiantynivka the night before; Ukrainian artillery fire from the city was reported in a local Telegram group just minutes before the strike on the market.

Further evidence reveals that minutes before the strike, the Ukrainian military launched two surface-to-air missiles toward the Russian front line from the town of Druzhkivka, 10 miles northwest of Kostiantynivka.

In the aftermath of the attack, Ukrainian authorities said Russian forces used a missile fired by an S-300 air defense system, which Russia has used both to intercept aircraft and strike targets on the ground.

The metal facades of buildings closest to the explosion were perforated with hundreds of square or rectangular holes, probably made by cube-like objects blown outward from the missile.

In any case, at such a short range — less than 10 miles — the missile is most likely to have landed with unspent fuel in its rocket motor, which would detonate or burn upon impact, offering a possible explanation for the widespread scorch marks at the market.

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