Clash of the Superpowers: America vs China review – Trump vomits all over Norma Percy’s film

The revered documentarian wades into unexplored territory with the US president and Xi Jinping’s relationship – and there is a moment so startling that it feels like pure comedy gold

It’s not normal to view documentaries about international trade negotiations as light relief, but we are where we are. Clash of the Superpowers: America vs China is a two-parter produced by film-maker Norma Percy, whose signature style – on series including The Iraq War, Putin vs the West and Inside Europe: Ten Years of Turmoil – is to use first-hand testimonies to revisit diplomatic flashpoints from a decade or so ago: sufficiently soon after the events for everyone who was there to still be alive, but late enough for them to no longer be in the same job and now be willing to gossip.

Percy’s latest opens with the arrival of Chinese president Xi Jinping at the Davos forum in 2017. On his debut appearance at the event, Xi stimulates delegates with a speech positioning himself as a champion of free trade, offering to work with other countries for mutual economic benefit. What might historically have been an odd tack for China’s leader is not that surprising to the bankers, financiers and politicians in the room, who know Xi is pre-empting the inauguration, a few days later, of Donald Trump as US president.