The Volgoneft 212 and Volgoneft 239 tankers, each reportedly carrying over 4,000 tonnes of oil, ran aground in the Kerch Strait, which runs between Russian-occupied Crimea and Russia proper, on 15 December.
The oil washed ashore soon thereafter, stretching for at least 54 kilometres across the Russian Black Sea coastline in the Krasnodar region, state-affiliated news agency Interfax estimated on Wednesday, adding that up to 23,500 tonnes of contaminated sand had been collected in the region so far.
However, volunteers previously complained that the authorities had not properly disposed of the contaminated sand — in the popular resort town of Anapa, for example, bags of oil which were not promptly removed from the Black Sea coast began to degrade and wash back out to sea due to a storm in the early hours of Monday.