World leaders mark UN at 75, challenged by Covid-19 and US-China tensions

World leaders came together, virtually, on Monday to mark the 75th anniversary of the United Nations, as the deadly coronavirus pandemic and tensions between the United States and China challenge the effectiveness and solidarity of the 193-member body.

As Covid-19 began to spread around the world earlier this year, forcing millions of people to shelter at home and devastating economies, countries turned inward and diplomats say the United Nations struggled to assert itself...