Earlier this month, a tanker laden with thousands of tonnes of crude oil, which had set off from a Russian port on the Baltic Sea, sailed down the west coast of Ireland. The decision by the Sierra, a 250-metre tanker which was destined for India, to sail around the British Isles and into the North Atlantic, rather than take the more direct route through the English Channel, has caused confusion and concern among maritime and naval experts.

The tanker, which passed by the west coast of Ireland on July 10th, was just one of the rising number of sanctioned Russian ships, known as shadow fleet vessels, to sail through Irish-controlled waters in recent months. The suspicious and bizarre behaviour of these vessels has prompted the Irish Defence Forces and Government to step up maritime monitoring because of environmental and national security concerns.

What is this Russian shadow fleet and why are some of their vessels taking the longer route around the Irish coast and sailing outside recognised shipping lanes? And what are the security and environmental risks posed by these ships?

Irish Times crime and security correspondent Conor Gallagher discusses the dramatic increase in the number of sanctioned Russian ships sailing through Irish-controlled waters. Presented by Sorcha Pollak. Produced by Suzanne Brennan and Andrew McNair. 

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