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But it seemed the oligarch would not be using it over the festive period - records show it had been chartered by a company based in the British Virgin Islands.

They also highlighted how tax havens like Panama and the British Virgin Islands were used by the rich and powerful to allegedly hide their wealth and avoid tax.

They alleged the scheme dates to 2000 and involved sham foundations and shell companies in Panama, Hong Kong and the British Virgin Islands.

Sazonov testified on Tuesday about contracts for the first four sales arranged by Bouvier, which listed the sellers as companies in places like the British Virgin Islands and Hong Kong.

Last April, Chris Kotchick, a Scranton, Pa., oral surgeon, and his family spent a week on a chartered catamaran in the calm, clear waters off the British Virgin Islands.