The US and UK refused to sign a declaration on “inclusive and sustainable” artificial intelligence at a landmark summit in Paris, undermining hopes for a coordinated approach to developing and regulating the technology, The Guardian writes.

The communiqué says priorities include “ensuring AI is open, inclusive, transparent, ethical, safe and trustworthy, taking into account an international framework for all” and “ensuring AI is sustainable for people and the planet.”

On Tuesday, the document was supported by 60 other signatories, including France, China, India, Japan, Australia and Canada. The U.S. and U.K. did not immediately explain their reasons for refusing to sign.

Confirmation came shortly after U.S. Vice President J.D. Vance took the stage at the Grand Palais to criticize “over-regulation” of technology in Europe and warned against cooperation with China. Asked whether Britain refused to sign the declaration because it wanted to follow the US lead, a spokesman for British Prime Minister Keir Starmer said they were “not aware of the US reasons or position” on the declaration.

The sources added that the UK joined the summit's coalition for sustainable artificial intelligence and supported the cybersecurity declaration. A government source said the declaration was not strong enough from a security perspective and did not reflect the UK's approach as a country.

However, they rejected the suggestion that Britain was trying to ingratiate itself with the US.