There have been several notable incidents in Taiwan involving Coast Guard law enforcement actions, including arrests and prosecutions. For example, in June 2024, a 60-year-old Chinese man, surnamed Ruan, entered Taiwan aboard a speedboat via the Tamsui River, raising national security concerns. According to reports, Ruan was a former captain in China's navy and managed to bypass several layers of maritime defense before being intercepted by Taiwan's Coast Guard near Taipei Harbor. Upon his arrest, authorities found he lacked legal documentation for entry. He was subsequently detained and investigated by prosecutors for illegal entry under Taiwan's immigration laws. In court, Ruan admitted to entering Taiwan without authorization and was sentenced to eight months in prison. The incident sparked a broader debate over Taiwan's coastal security measures and prompted the Coast Guard Administration to review and tighten patrol operations in sensitive maritime areas.