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In the southern Ukrainian city of Melitopol on Monday, the mayor Ivan Federov sat down at his desk to send out his daily Facebook update.

He told his followers that the Russians forces occupying the city had now taken control of the city's communications network, so they needed to be wary of what they heard on TV and the radio.

How many people would see his warning, he didn't know. Melitopol's internet connection had also all but disappeared, making it nearly impossible to reach people inside by WhatsApp or Telegram call, or stay connected for more than a few minutes.