The attacks appear to be the latest phase of Ukraine's bid to choke off supplies and routes into and out of occupied Crimea.

The attacks appear to be the latest phase of Ukraine's bid to choke off supplies and routes into and out of occupied Crimea.

Footage shows huge flames rising from a building and thick, black smoke rising into the sky.

Data shows a decline in the number of ships - many carrying oil and gas - going through the waterway after attacks this week.