Shadow ships are on the rise - how can they be tackled?

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The BBC's diplomatic correspondent Paul Adams and BBC Verify's Kayleen Devlin examine the sanction-busting vessels, which are often at the heart of some of today's most contentious geopolitical issues. BBC InDepth is the home of the best news analysis, with fresh perspectives that challenge assumptions and deep reporting on the biggest issues of the day. You can find more articles from InDepth - like this one - on the BBC News website and app. (Image: AFP / Getty)