The threat posed by authoritarian regimes is a "wake-up call for democrats worldwide," Taiwan's leader said Tuesday, as she opened a meeting of global activists that included fugitive Hong Kong dissident Nathan Law.About 200 political and civic leaders from 70 countries, including Iran, Russia and Ukraine, were attending the assembly in Taipei."The challenge posed by authoritarian regimes is an important wake-up call for democrats worldwide," she said in a summit speech that cited Russia's invasion of Ukraine."It's very clear that Xi Jinping is amassing power, centralizing more power, and I think it has very bad implications for the world," he told AFP on the sidelines of the summit.There has been an outpouring of public support for Kyiv in Taiwan, which has sent money and vowed to uphold Western sanctions."