WASHINGTON (BLOOMBERG) - President Donald Trump has said it's not the right time for trade negotiations with China, denting expectations for a near-term deal after a breakthrough agreement between the US and Mexico.

Speaking to reporters during his announcement on Monday (Aug 27) of the new Mexico accord, Mr Trump said he is rejecting overtures from China to negotiate as he tries to achieve a less "one-sided" trade policy.

"They want to talk," Mr Trump said. But "it's just not the right time to talk right now, to be honest."

Mr Trump's remarks are his latest in recent weeks to suggest he doesn't see a quick end to trade tensions with China, stoking concerns in Beijing that his actions are part of a wider plan to contain the nation's rise.

Fears are growing that the spat between the world's biggest economies may spill over into geopolitical flash points, from North Korea to Taiwan.

Negotiations between the US and China have been stalled since May, when Mr Trump put a stop to a deal for China to buy more energy and agricultural goods to narrow the trade deficit.

After mid-level trade talks in Washington last week ended with no agreement, a person familiar with the discussions said that Chinese officials had raised the prospect of suspending talks until after US congressional elections in November.

The US and Mexico agreed to replace the North American Free Trade Agreement and Mr Trump called on Canada to join the deal soon or risk being left out.

While share prices for South Korean and Japanese automakers gained amid expectations of reduced tariff risk, Mexico's peso weakened 0.4 per cent against the dollar in Asian trading on Tuesday, paring about half its Monday climb.

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"It could be because a dose of reality is sinking in after the initial euphoria," said Mr Mitul Kotecha, senior emerging-markets strategist in Singapore at TD Securities. "There is still some way to go before the deal is concluded, including political hurdles in both the the US and Mexico and the question of how Canada will be added to a broader deal."

The Mexico breakthrough will embolden Mr Trump's trade hawks to double down on demands for concessions from China, according to Mr Rob Carnell and Mr Prakash Sakpal, economists at ING Bank NV in Singapore.

"So as far as China and Asia are concerned, this new Mexico deal solves nothing," they wrote in a note. "It strengthens the US position to play hard-ball with China. This doesn't look good for the region."

Because the nature of the dispute between China and the US is more complex, officials in Beijing are likely of the view that it be much tougher to resolve, Ms Amy Celico, Principal of Albright Stonebridge Group and previously Senior Director for China Affairs at the Office of the US Trade Representative, told Bloomberg Television.

"For US-China trade, it is going to be much more difficult to come to a short-term resolution, particularly if we sit back for a minute and look at some of the rhetoric coming out of this administration," Ms Celico said. "The hawks are certainly in the ascendancy on China trade policy."

Meetings between Chinese and US officials in Washington last week made little headway, setting the stage for the US to push ahead with the next round of tariffs on up to US$200 billion (S$272.83 billion) worth of Chinese goods. Beijing has said it would retaliate.

The two days of talks led by US Treasury Undersecretary for International Affairs David Malpass and Vice-Commerce Minister Wang Shouwen marked the first major interaction between the two sides since June.

Mr Trump wants to shrink a US$375 billion goods deficit with China and Beijing to unwind industrial subsidies and scale back its "Made in China 2025" plan to lead the world in industries such as artificial intelligence and robotics.

So far, there's been little indication of compromise.

Still, Mr Trump did hold the door open for an eventual resolution with China.

"It's been too one-sided for too many years, for too many decades and so it's not the right time to talk," he says, "But eventually, I'm sure that we'll be able to work out a deal with China."