World Health Assembly holds annual meeting as China and United States differ over the coronavirus pandemic which has killed more than 300,000 people.
China's president called on Monday for an independent review of the global response to the coronavirus pandemic under the World Health Organization once the virus is under control, and defended Beijing's own handling of the pandemic.
In a video message to a virtual meeting of the WHO's decision-making body, the World Health Assembly, President Xi Jinping also pledged $2 billion over two years to help with the Covid-19 response.
During the two-day meeting, health ministers from around the world are expected to back calls for an independent evaluation of the WHO's performance, criticism of which has been led by US President Donald Trump.
The meeting could also be dominated by tension between China and the United States, which fiercely criticised Beijing's response in the early stages of the pandemic.
Calling the pandemic "the most serious global public health emergency since the end of World War Two", Xi said: "All along we have acted with openness and transparency and responsibility.
"We have turned the tide on the virus," he said.
The World Health Assembly is expected to discuss a resolution being presented by the European Union that calls for an independent evaluation of the WHO's performance under its director-general, Tedros Adhanom Ghebreyesus.
Names on a draft resolution seen by Reuters showed support from 116 of the 194 countries in the WHO.
UN Secretary-General Antonio Guterres called the WHO "irreplaceable" and said it needed greater resources to provide support for developing countries.
"Many countries have ignored the recommendations of the World Health Organization," he said. "As a result, the virus has spread across the world and is now moving into the global south, where its impact may be even more devastating and we are risking further spikes and waves."
Guterres said it was a "false dichotomy" to assume governments would be choosing between saving their citizens or their economies.
"Unless we control the spread of the virus, the economy will never recover,” he warned. He called for the G20 countries to urgently consider a large-scale stimulus package that would amount to a “double-digit percentage of global GDP."
WHO promises probe
Ghebreyesus pledged to launch an independent probe to review the coronavirus pandemic response as soon as possible.
"I will initiate an independent evaluation at the earliest appropriate moment to review experience gained and lessons learned and to make recommendations to improve national and global pandemic preparedness and response," he said.
Swiss President Simonetta Sommaruga pledged her country's "full support and cooperation" to Tedros as the WHO coordinates the global response to the coronavirus pandemic, which has killed more than 300,000 people worldwide.
The WHO and most experts say the virus is believed to have emerged in a market selling wildlife in the central city of Wuhan late last year.
US Secretary of State Mike Pompeo said this month there is "a significant amount of evidence” the virus came from a laboratory in Wuhan, a charge China rejects and the US intelligence agency also refutes.