US President Donald Trump has invited his Chinese counterpart Xi Jinping to sign the phase one of a bilateral trade deal when it is agreed upon, according to a top White House official. Trade talks between the world's two largest economies began in November last year but have not yielded desired results even after more than a dozen rounds of negotiations in both Beijing and Washington.

The two countries have failed to reach any agreement to resolve the trade dispute that escalated after Trump slapped huge tariffs on Chinese goods, prompting tit-for-tat responses from China.

US National Security Advisor Robert O'Brien, who is one of the most senior members of the Washington delegation in Bangkok for the Association of Southeast Asian Nations (ASEAN) meeting, said that the US wants "great relations" with China.

"President Trump has invited President Xi to the United States if we are able to get that deal to sign phase one trade agreement, we'll have to see if that comes to pass or not. I am optimistic about it, I may actually say I'm cautiously optimistic about it.

"We think good relations between the United States and China is good for both of our countries, but it's also good for the world, it's good for the region here. So we seek good relations with China, but if we see conduct that's not fair, especially if it is conduct that is not fair to our friends and partners and allies in the region, we're not going to be shy about pointing it out," O'Brien said.

"I think we're relatively close to an agreement, a phase one agreement on trade that would make trade fairer and freer and more reciprocal between the US and China. We hope that comes to pass," he said in response to a question.

When it comes to the international waters of the Pacific, the US does not believe that any country should just seal off massive portions of the Pacific Ocean and claim that they are territorial waters like it's a lake, O'Brien said.

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