The United Nations has said it will raise the detention of Princess Latifa, the daughter of Dubai's ruler, with the United Arab Emirates (UAE).
Princess Latifa has accused her father of holding her hostage in Dubai since she tried to flee the city in 2018.
In secretly recorded videos shared with the BBC, Princess Latifa said she feared for her life.
The footage prompted global calls for a UN investigation, while the UK said the videos were "deeply troubling".
"We are concerned about it," UK Foreign Secretary Dominic Raab said on Wednesday.
He said the videos showed "a young woman in deep distress", adding that the UK would watch any developments from the UN "very closely".
But when asked whether sanctions could be imposed, Raab said: "It's not clear to me that there would be the evidence to support that."
Prime Minister Boris Johnson also said the government was "concerned" but would "wait and see how [the UN] get on" with their investigation.
The Office of the UN High Commissioner for Human Rights has said it would soon question the UAE about Princess Latifa.
"We will certainly raise these new developments with the UAE," spokesman Rupert Colville said. "Other parts of the UN human rights system with relevant mandates may also become involved once they have analysed the new material".
Meanwhile, a spokesman said the UN Working Group on Arbitrary Detention could launch an investigation once Princess Latifa's videos have been analysed.
