Oligarchs fret about their assets as UK fights to keep tabs on their spending

The superyacht Le Grand Bleu, owned by the oligarch Eugene Shvidler, is now laid up in Puerto Rico. Photograph: Alan Spencer/Alamy

It is hurricane season in the Caribbean and the billionaire owner of Le Grand Bleu, one of the largest superyachts ever to sail the seven seas, is losing sleep over it.

The 113-metre-long vessel belongs to Eugene Shvidler, a Russian-born oil tycoon who was sanctioned by the UK last year, due in part to his long association with Roman Abramovich, himself accused of enjoying a cosy relationship with Vladimir Putin.