"We are not going to let the United States be taken advantage of anymore".
The difference between Trump's and China's approaches was made more stark by comments in a later speech from Chinese President Xi Jinping, who said globalisation was an irreversible trend and voiced support for multilateral trade deals.
Trump arrived in Vietnam from China on the fourth leg of a 12-day trip to Asia.
"We have witnessed changes more rapid and complex than we expect", he said in opening remarks.
One of his first acts as president was to withdraw the USA from the Trans-Pacific Partnership (TPP) trade deal, turning his back on the so-called "Asia pivot" policy favored by his predecessor, Barack Obama, who wanted to bolster United States influence in the region as a counterbalance to China.
Reuters said Japanese Economy Minister Toshimitsu Motegi said on Friday that countries including Canada had now agreed on a plan to move ahead with the Trans Pacific Partnership (TPP) trade deal. He also said that China was committed to speeding up negotiations for the Regional Comprehensive Economic Partnership - a trade pact among all 10 Asean members and six key partners.
It said that the ministers maintained "the high standards, overall balance and integrity of the TPP while ensuring the commercial and other interests of all participants and preserving our inherent right to regulate, including the flexibility of the parties to set legislative and regulatory priorities".
He also said that America would no longer enter into large-scale trade pacts that he said disadvantaged his country, preferring instead bilateral trade agreements.
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Mr. Trump reiterated his markedly different stance on trade before the 21-member APEC summit convened late Friday with a gala banquet.
Mr. Trump said he would not enter into large trade agreements, alluding to USA involvement in the North American Free Trade Agreement and the TPP.
Partly to counter China's growing dominance in Asia, Japan had been lobbying hard for the TPP pact, which aims to eliminate tariffs on industrial and farm products across the 11-nation bloc whose trade totalled US$356 billion (RM1.4 trillion) a year ago.
Motegi, taking part in the Abe-Trudeau summit, said "no clear explanation" was offered as to why Canada can not support and announce the agreement at the leaders' level.
APEC operates by consensus and customarily issues nonbinding statements.
As a developing country with a fast-growing export sector, this year's host country, Vietnam, has a strong interest in open trade and access for its exports to consumers in the West.
Abe returned to the room saying Trudeau was not attending and so the meeting was abandoned by the other countries, Australia, New Zealand, Singapore, Brunei, Malaysia, Chile, Peru, Mexico and Vietnam.