Enlarge / A sign outside Canada's embassy in Beijing supporting Ukraine. It was later defaced, and posts about the incident were scrubbed from Chinese social media. Kevin Strayer | Getty Images reader comments 61 with 40 “Artillery fire lights up the sky and breaks my heart. I hope my compatriots in Ukraine are taking care of themselves and their families,” said a user on Weibo, often called China’s Twitter, on February 27. The message was quickly blocked, according to Free Weibo , a service of Great Fire, which tracks Chinese censorship online. Two days later, a very different message appeared...