A mass arrest of moderate pro-democracy figures in Hong Kong signals an escalation in the application of the city’s national security law to a broader segment of the political opposition, which will increasingly limit the policymaking power of any pro-democracy forces. The first-time detention of a U.S. citizen, meanwhile, will also test whether U.S. President-elect Joe Biden's incoming administration will be able to navigate Hong Kong tensions without jeopardizing its broader relations with Beijing. On Jan. 6, Hong Kong police carried out a citywide operation in which nearly 1,000 officers netted 53 pro-democracy activists and former lawmakers linked to the July 2020 opposition primary for legislative council elections, leveling accusations of subversion under the city’s draconian national security law. ...