A man protests the declaration of a state of emergency last week in Belgrade with a banner showing Serbian President Aleksandar Vučić, left, and China’s President Xi Jinping. The banner reads, “Serbs and Chinese Brothers Forever.”

A man protests the declaration of a state of emergency last week in Belgrade with a banner showing Serbian President Aleksandar Vučić, left, and China’s President Xi Jinping. The banner reads, “Serbs and Chinese Brothers Forever.”