Bulgaria is to ask the Greek authorities to hand over a young girl who was found in a Roma camp in Greece.
Four-year-old Maria made global headlines when she was found living with a Roma couple - who were not her real parents - in the Greek town of Farsala this month.
DNA tests last week confirmed a Bulgarian couple, Sashka and Atanas Ruseva, were the blonde youngster's biological parents.
The pair, who have nine other children, five of whom are also blonde, live in a ghetto in the central town of Nikolaevo.
Sashka Ruseva, Maria's biological mother, who denies selling her in Greece Mrs Ruseva, who is under investigation for allegedly selling Maria in 2009, has said she gave birth to a baby girl four years ago in Greece while working as an olive picker.
She has admitted giving the child away because she was too poor to care for her, but has denied she took any money for her, and has said she wanted to take the girl back.
The Greek Roma couple, who have been charged with abducting Maria and procuring false documents relating to the girl's birth certificate, have also said they want to keep her.
The pair, named locally as Hristos Salis, 39, and Eleftheria Dimopoulou, 40, deny the charges.
Bulgaria's child protection agency said on Tuesday that it would "undertake the necessary actions for the return of Maria ... who was indisputably proven to be the child of Sashka and Atanas Ruseva".
Maria was found living with Hristos Salis and Eleftheria Dimopoulou However, she is unlikely to rejoin her poverty-stricken family if she is sent back to Bulgaria and will instead be placed in a crisis centre or in foster care.
"Maria will remain there until a solution is found for her upbringing - a return to the biological family, or placement with relatives, in foster care or in a social institution," the agency said.
The agency also ordered a review of the conditions under which Maria's seven younger siblings were raised, with a view to taking protective measures if necessary.
Maria is currently in the care of Athens-based charity Smile of the Child.
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