Ireland has been used as a transit base to smuggle at least 6,000 Ukrainians into Britain over the past two years, according to Spanish police who have smashed a gang which supplied them with fake Polish passports.
Spanish National Police said the investigation — named operation Kolso — was launched after 56 Ukrainian migrants were detained at 12 Spanish airports for carrying fake documents, which cost them anything between €300 and €1,500.
The majority of them were booked on flights to Dublin.
Spanish police said that since Russian forces had annexed Crimea from Ukraine, many Ukrainians had fled the country in the hope of making it to Britain.
A Romanian man was then arrested and is claimed to be one of the kingpins of the organisation who vetted the Ukrainians before they were given false documentation.
In several cases the falsified documents were extremely well produced.
A Europol source said that the cheaper ones were issued with lookalike photographs while the more expensive ones featured the picture of the person who was actually travelling.
The Spanish say that risk analysis carried out by the European border agency, Frontex, clearly indicated that in recent years a noticeable number of Ukrainians travelling with false documents passed through Dublin Airport.