U.S. President Donald Trump's latest trade gamble has set the stage for a tense round of negotiations this week between the U.S. and China, which has the markets on edge.

Trump's unpredictability was on full display Sunday, when he took to Twitter to abruptly announce he's increasing tariffs on Chinese goods. The U.S. says that threat was prompted by Beijing reneging over the past week on some key commitments it made during the talks.

A diplomatic cable from Beijing arrived in Washington late on Friday night, with systematic edits to a nearly 150-page draft trade agreement that has blown up months of negotiations between the world's two largest economies, according to three U.S. government sources and three private sector sources briefed on the talks.