SCMP’s North America correspondent Mark Magnier analyses the agenda and impact of Chinese leader Xi Jinping’s unofficial summit with Central Asian leaders at the Beijing Winter Olympics, as the geopolitics of citizenship weigh on Chinese-American athletes competing for gold. Political economy journalist Kandy Wong looks at what two years of Trump’s tariffs and the phase-one trade deal have brought to the US, and how Australian exporters are calling for a new approach to relations with China…