The EU’s climate targets are among the world’s most ambitious, but they have been based entirely on domestic emissions cuts. Now it faces a mid-September deadline to submit a new 2035 climate target to the UN.

Brussels has refused Beijing’s repeated requests for a mutual climate commitment after the summit of the world’s second- and third-largest economies, unless China promises to do more to cut greenhouse gas emissions, EU officials said.

“There is only merit in having a declaration from our perspective if there are also content nuts to be cracked and ambition to be displayed,” climate commissioner Wopke Hoekstra told the paper.

China, which has been struggling to strike a balance between fostering economic growth and reaching environmental goals, is expected to miss a five-year goal for an 18% cut in carbon intensity by the end of this year.

Reuters could not immediately verify the report, and the European Commission did not immediately respond to a request for comment.