For the first time in its 25-year history, the Asia-Pacific Economic Cooperation summit ended on Sunday with its leaders failing to agree on a formal joint statement.

All 21 APEC leaders at the annual meeting in Papua New Guinea were in agreement except China, a source within the meeting told CNN.

Canadian Prime Minister Justin Trudeau confirmed late on Sunday that disagreements on trade stood in the way of a final statement.

“There are differing visions on particular elements,” Trudeau said.

China may have been concerned about a specific line about unfair trade practices, according to a US official involved in the negotiations. The two countries are embroiled in a bitter trade war that has seen each enact tariffs on billions of dollars worth of goods.

The official said the most “problematic” line for the Chinese was: “We agree to fight protectionism including all unfair trade practices.”

“They seemed to think that the ‘unfair trade practices’ was some kind of singling out,” the official contended.

“It’s a little concerning that it appears that China didn’t really have any intention in the end of reaching consensus,” the official said.

The Trump administration has repeatedly accused China of unfair trade practices to justify the tariffs it has imposed on $250 billion of Chinese goods.

“For many years, China has pursued industrial policies and unfair trade practices… that champion Chinese firms and make it impossible for many United States firms to compete on a level playing field,” the White House said in a fact sheet in May about Trump’s confrontation with Beijing over trade.

Vice President Mike Pence, who attended the forum in President Donald Trump’s place, told the gathering in Port Moresby that “China has taken advantage of the United States for many, many years and those days are over.”

The language in Pence’s speech echoed his landmark address last month on China, during which he said the United States “will demand that Beijing break down its trade barriers, fulfil its obligations, fully open its economy – just as we have opened ours.”

In his speech on Saturday, Chinese President Xi Jinping spoke of the need for global cooperation and trade and said all differences could be bridged “through consultation.”

“History has shown that confrontation, whether in the form of a cold war, a hot war, or a trade war, will produce no winners,” Xi said.

China’s Global Times released an editorial on Monday stating that it was “not a big deal” that the APEC summit ended without a joint communique for the first time in a quarter of a century.

The piece also accused Trump’s administration of spreading falsehoods about China’s abuse of international organizations like the World Trade Organization.

“It’s delusional of some US elites to think that China is the largest beneficiary of the international system since they mistakenly blame China for the US’ own problems. China has realized its development through hard work, not by taking advantage of the international system,” the piece read.

Pence said Washington wouldn’t ease the trade war with Beijing until it “changes its ways” in his Saturday address.

The Trump administration has levied tariffs on $250 billion in Chinese products since July. The tariffs on $200 billion of those goods are set to increase to 25 percent from 10 percent on January 1, which would further escalate the conflict.

China has so far retaliated with tariffs on $110 billion of US products and is likely to respond with more if the United States goes ahead with the increase at the start of January.

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