UNITED NATIONS, United States, Aug  5, 2022 (BSS/AFP) - UN chief Antonio 
Guterres believes it is impossible to tackle the world's biggest challenges 
without cooperation between the United States and China, his spokesman said 
Friday, as the two superpowers' relations nosedive over Taiwan.
       
"For the secretary-general there is no way to solve the most pressing 
problems of all the world without an effective dialogue and cooperation between 
the two countries," Guterres' spokesman Stephane Dujarric told reporters.
      
 He was reacting to a question about China's decision to end cooperation 
with the United States on a litany of issues from climate to military talks.