No, the UAE isn’t a signatory to Hague Convention.
More information here:
https://assets.publishing.service.gov.uk/media/600722a9e90e072f5713bd0d/United_Arab_Emirates_-Child_Abduction_Information-_December_2020.pdf
And, while we’re on the subject, and because it reminded me of something horrible I heard about when I lived in Dubai, FGM is also legal in the UAE.
While I lived there, the government banned it in government clinics and hospitals, where it had previously been performed legally, but it is still widely, and legally, available in other health facilities in one of the UAE’s classic ‘let’s look superficially western-friendly but not really change anything’ moves.
It’s a significant ‘FGM tourism’ destination for British girls, whose parents like the idea it will be done ‘safely’ in a medical environment rather than by a traditional practitioner.
The horrible story I heard from several sources when I lived in Dubai. I can’t find any trace of it online, but that was often the case, as the press is heavily censored, and some things I heard about via word of mouth (like the first escape attempt and imprisonment of Sheikha Latifa ) were corroborated later, in the international press.
An American woman had married and had a child with an Emirati man. The marriage became unhappy, they divorced, and she was allowed to have custody of their daughter (typically UAE law allows mothers to have sole custody of girls till the age of 13). I don’t know how old this little girl was, but much younger than that. Her mother let her father take her for a day or an overnight visit at some point, because things seemed amiable, and discovered when her daughter came home, that her father had taken her to a clinic and had had FGM performed upon her. Perfectly legally.