NEW: Chinese national Xu Zewei was extradited to the United States this weekend, according to his lawyer. Xu is accused of working for the Chinese government hacking group Hafnium, which was allegedly behind the hack of thousands of Microsoft Exchange servers, as well as stealing COVID-19 research from U.S. universities. https://techcrunch.com/2026/04/27/hacker-who-allegedly-carried-out-cyberattacks-for-china-is-extradited-to-u-s/