A month before his official inauguration, Donald Trump is already tossing diplomatic grenades in China’s direction. It is a sign of things to come. 2017 is shaping up to be a highly eventful, taut and precarious year for China-US relations. This is partly due to a simple scheduling coincidence.

2017 will be the first time ever when both the US and the PRC in the same year will usher in new governments. The US will kick things off on January 20th by swearing in Donald Trump as President. China, meanwhile, will undertake its own large political upheaval, its five-yearly change in political leadership, culminating in the 19th Communist Party Congress sometime late in the year. Virtually the entire government hierarchy, from local mayors on up, will be changed in a monumental job-swapping exercise orchestrated by Xi Jinping, China’s president.

The US under Mr Trump, with a Republican Congress at his back, seems intent to challenge China more assertively in trade, investment and as a currency manipulator while intensifying the military rivalry. China’s leadership, meantime, will become deeply absorbed in its own highly secretive, inward-looking and internecine political maneuvering. While Mr Xi tries to further consolidate his power, Mr Trump will likely be asserting his, leading to a globally ambitious US and an introspective China. This would represent something of a role reversal from recent precedent.