Just when it seemed as if the U.S. and China might have taken a step along the path toward easing trade tensions, a top executive of Huawei, a Chinese technology giant, has been arrested in Canada at the request of American authorities. 

Now, a mere five days after President Donald Trump and China’s Xi Jinping dined together on Dec. 1 during the G20 summit and announced a 90-day truce on tariffs, analysts are speculating that the tentative agreement, which was already mired in confusion, is unraveling, along with any goodwill that the meeting might have generated between the two countries.