Nearly three years into the COVID-19 pandemic, leaders of G20 countries are gathering on the Indonesian resort island of Bali with strict testing and masking requirements, even though such measures have been largely dropped in some member countries. It is Chinese President Xi Jinping’s first G20 summit – and only his second trip abroad – since the start of the pandemic as his country continues its zero-COVID policy of lockdowns and quarantine that are among the world’s strictest. Other G20 nations have varying measures in place and different social conventions for the coronavirus, which has so far infected 631 million…