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Authorities from at least 18 other countries have been involved and the operation is still continuing, with more arrests expected in the next few weeks, Europol said.

Most of the suspects, detained last month, are Russian nationals, according to EU law enforcement agency Europol.

Europol, the EU's policing body, worked alongside Colombian investigators to track Belvedere down in Medellín.

Europol also said a number of threats to life were prevented and a drug laboratory in Australia was dismantled.

The Europol documents mention a complex deal to sell a plot of land, on Bulgaria’s Black Sea coast, that links one of Ms Ignatova’s companies to Taki’s wife.