Documents have emerged that are alleged to show that Michael Zolotas, former chief executive of Greece's NewLead Holdings, received kickbacks from the sale of shares, laundered money and hid assets.

The documents have been revealed in court papers filed in New York by TransAsia Commodities Investment, led by its principal Serge Turko, which seeks to collect $22.3m owed in damages by NewLead and Zolotas from litigation that concluded this year.