[Editor's note] Dr XU Hong, an alumnus of the Institute of International Law of Wuhan University, is now serving as the Chinese ambassador in the Kingdom of the Netherlands. On May 1, he published an open letter in the Dutch newspaper Het Financieele Dagblad. In the letter, he calls for international cooperation and solidarity to fight this global crisis and urges end to politicizing the COVID-19 pandemic. This is a full text of his letter: