Syrian leader Bashar al-Assad is pictured meeting the UAE's Deputy Prime Minister Sheikh Mansour bin Zayed Al Nahyan, who owns Manchester City Football Club
In his first trip to the United Arab Emirates (UAE) since the Syrian civil war began 11 years ago, Assad met several influential figures last week.
He was photographed with Mansour, who is deputy prime minister of the UAE.
A spokesperson for the Foreign Office said such meetings "undermine the prospect" of peace in Syria.
Assad's trip marks a potential warming in Syria's relations with its Arab neighbours, which had previously isolated the Syrian president.
UAE rulers signalled a willingness to strengthen ties with Syria again.
In a statement to The Athletic, the Foreign, Commonwealth and Development Office (FCDO) responded to the move by saying: "It is the UK's firm belief that - in the absence of a change in behaviour by the Syrian regime - strengthening ties undermines the prospect of a lasting and inclusive peace in Syria."
Jonathan Hargreaves, UK special representative for Syria, posted on Twitter: "After 11 years of conflict Assad's unreformed and unrepentant regime continues to commit atrocities against the Syrian people.
"Without changes in behaviour, engagement only serves to undermine collective efforts to encourage Assad to participate in the UN-facilitated political process in good faith…
"The UK remains opposed to any normalisation of relations with the Syrian regime."
Labour MP Chris Bryant, chair of the All-Party Parliamentary Group on Russia, shared those concerns and, in an interview with The Telegraph, went on to question if Mansour was a "fit and proper person to be owning a football club".
BBC Sport has approached Manchester City for comment.
-- Courtesy of BBC Sport