"Greek democracy fought and eliminated the poison of the Golden Dawn party," government spokesperson Aristotelia Peloni said on Saturday.
"The rule of law stood firm against criminals, and Justice gave its answer with its decisions," Peloni continued.
"But no complacency is allowed," the spokeswoman said, adding: "Greek authorities moved immediately and in a coordinated manner both for the issuance of the European arrest warrant and for the surrender of Ioannis Lagos in order to serve his sentence."
"However, a constant struggle is needed so that the democracy does not face such phenomena again," Peloni underlined.
Lagos was sentenced to 13 years in prison by a Greek appeals court in October 2020 for his membership and role in the neo-Nazi party Golden Dawn, which was prosecuted as a criminal organisation.
He was sentenced on October 7 last year in prison for directing the criminal organisation.
Lagos, a Member of the European Parliament, also has a second sentence of nine months for an attack in 2013.
It is recalled that according to the court decision, Lagos along with Nikos Michaloliakos and five other former members of the Golden Dawn, have been found guilty for directing a criminal organisation.
They are Nikos Michaloliakos, Christos Pappas, Ilias Kasidiaris, Ioannis Lagos, George Germeni, Elias Panagiotaros and Artemi Mattheopoulos.
Pappas remains a fugitive.
READ MORE: Former Golden Dawn MEP arrested in Belgium.