Leaders of the Asia-Pacific Economic Cooperation (Apec) forum yesterday failed to issue a joint communique for the first time in the grouping's history, reflecting the deep division on trade.
He says there were differences on trade issues among several countries including China and the USA, which have been engaged in a tit-for-tat tariff war this year.
O'Neill, who was chairman of the meeting, also pointed out that the sticking point was over whether the mention of the World Trade Organization and its possible reform should be in the Leaders' Declaration.
Pence also said the United States would join Australia to help Papua New Guinea build a navy base on its Manus Island, which was a USA base in World War Two.
Over the weekend, risk-of headlines began to once again leak out of the market headline machines, and the market's Monday open could see riskier assets trading into the low end as Asia trade tensions remain peaked, while the ongoing Brexit process has unraveled to the point that the United Kingdom may be finding itself a new Prime Minister. They settled on a statement to be issued, instead, by the meeting's chair, Papua New Guinea Prime Minister Peter O'Neill.
He said: "You know the two big giants in the room".
Vice President Mike Pence sharpened United States attacks on China during a week of summits that ended Sunday, most notably with a call for nations to avoid loans that would leave them indebted to Beijing.
On Saturday, both Pence and Xi made speeches aimed at discrediting each other, and calling into question their motives in the region.
Draft versions of the proposed communique at Port Moresby, as reported by AP, showed that the United States wanted strong language against unfair trade practices that it accused China of perpetrating.
The world, according to Xi's speech, is facing a choice between cooperation and confrontation as protectionism and unilateralism grows.
APEC ended in a troubling, but somewhat fitting way.
The US also announced it would partner with Australia and Papua New Guinea to upgrade the Lombrum Naval Base on Manus Island, which could hand Washington another crucial strategic outpost in the Pacific.
The US is interested in a better relationship "but there has to be change" from China's side, Pence said he told Xi, who responded that dialogue is important.
Stocks in Asia kicked off the week in lackluster fashion after the discord, and the Australian and New Zealand dollars fell from near multimonth highs.
Prime Minister Justin Trudeau was the first to signal all was not well at the summit, which is meant to promote Trans-Pacific cooperation.
Only about 20 percent of Papua New Guinea's 8 million people have electricity and for a significant proportion of them the supply is not reliable.
One of the poorest countries in the world, Papua New Guinea's biggest aid donors are now China and Australia.
Long's comments come as tensions between the two nations appear to have thawed somewhat ahead of an expected meeting between the countries' presidents in Buenos Aires, Argentina, later this month.
America had insisted that the statement from the Asia Pacific Economic Co-operation gathering should say that China no longer could be treated as a developing nation under World Trade Organisation rules, a clause that comes with favourable terms.