Analysis by Nathan Hodge for CNN.

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(CNN)-- The biggest threat to Ukrainian cities is Russian ballistic missiles, which can hit their targets with very little warning, or none at all.

Over the past few months, Ukraine has succeeded in putting Russia under pressure with strikes targeting Russian oil refining capabilities, causing long queues at petrol stations and setting fire to commercial logistics centres. But Russia has exploited a key Ukrainian weakness: a severe shortage of interceptor missiles…