The United States is warning Americans to reconsider travel to China. A look at the latest risks: Russian President Vladimir Putin set to join a virtual meeting with China’s Xi Jinping—his first appearance on the world stage after a coup at home; over $120,000 in bounties offered for eight overseas Hong Kong activists; the closure of a pro-democracy radio station, and more, marking the 26th anniversary of the city’s handover from British to Chinese rule; plus, nuclear wastewater from China dumped into the ocean. Reports say it’s six times more contaminated than water treated from Japan’s Fukushima nuclear plant. How does it play into the latest Tokyo–Beijing spat?…