By Jonathan Landay ZAPORIZHZHIA, Ukraine (Reuters) – A defiant Vladimir Putin proclaimed Russia’s annexation of a swathe of Ukraine in a pomp-filled Kremlin ceremony, promising Moscow would triumph in its “special military operation” even as he faced a potentially serious new military reversal. The Russian president’s proclamation of Russian rule over 15% of Ukraine – the biggest annexation in Europe since World War Two – was roundly rejected by Ukraine and Western countries, with the United States and Britain announcing new sanctions. Ukrainian President Volodymr Zelenskiy said his country ha…