Kerch likely needs prompt ballistic missiles with good countermeasures not cruise missiles. Otherwise there can be many minutes to hours of notice to prepare a defence.
Structures can burn. Fire produces heat. Heat impairs the strength of steel which imparts strength to concrete structures. When the steel fails, the concrete falls down, goes boom. We have semi-recent examples of said catastrophic failures.
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Or, with a bit of luck, it's not over yet, more to come ?