U.S. President Donald Trump's warm words for Chinese President Xi Jinping as a "good man" will reassure Beijing that he finally understands the importance of good ties but risk leaving America's allies in the region puzzling over where they fit into the new order.

The budding relationship between the two leaders appeared highly unlikely when Trump was lambasting China on the campaign trail for stealing U.S. jobs with unfair trade polices.

In December, after winning office, he upended protocol by taking a call from the president of self-ruled Taiwan, which China regards as its own territory.