Ukrainian President Volodymyr Zelensky on Sunday appealed for US President Joe Biden and China’s Xi Jinping to participate in a planned peace summit in Switzerland in June. “We do not want the UN Charter to be burnt down just like these books, and I hope you don’t want to either,” said Zelensky against the backdrop of a printing plant destroyed by a Russian missile attack in the north-eastern city of Kharkiv. “The efforts of the global majority are the best guarantee that all commitments will be fulfilled. Please, support the peace summit with your personal leadership and participation,” Zelen…