Increasingly overwhelmed by supply-chain disruptions and soaring raw material costs, Chinese exporters and foreign investors in China are feeling the pinch from Covid-19 restrictions and Russia’s invasion of Ukraine. Meanwhile, China’s worst coronavirus outbreaks in two years have triggered lockdowns across the country, including in the financial and trade hub of Shanghai . And parts of the country that have evaded lockdown are encouraging social distancing. None of that bodes well for this month’s China Import and Export Fair, aka the Canton Fair, which must again go solely online. The fair – held every year since 1957 – is the…