From the aol article link below, it left a 65 foot wide crater and may have been a 500 kilo bomb. The question is what was the planned target? Also are Russian pilots planning some of their “accidents?”
https://www.aol.com/russias-air-force-accidentally-bombs-130943492.html
Have no idea and not privy to Russian war plans.
Does not matter what the target was - likely some apartment building as usual.