China is the latest country to add its signature to a global effort to make sure that when a coronavirus vaccine is finally developed and ready for distribution, it will be given to the neediest people around the world.

Know as the COVAX initiative, it is sponsored by the World Health Organization and has signed up 157 countries. The WHO hopes the program will ensure that 2 billion doses of this life-saving vaccine will be made available to those most in need, no matter where they live, by the end of 2021.

“We have solemnly pledged to make vaccines developed and deployed by China a global public good, which will be provided to developing countries as a priority,” Hua Chunying, a spokeswoman for China’s foreign ministry, wrote on Twitter.

This is an about-face for China, which originally bowed out from joining COVAX. China is currently developing four vaccines that are in clinical trials. One of them, according to Wu Guizhen, chief biosafety expert at the Chinese Center for Disease Control and Prevention, should be ready to be used on the general population sometime in November. President of China, Xi Jinping promised back in May that he would make any Chinese vaccine available for “the global good.” At that time Xi also pledged $2 billion to WHO, making China the organization’s largest donor.

In early September, the United States announced its decision to stay away from the COVAX initiative, stating that:

“We will not be constrained by multilateral organizations influenced by the corrupt World Health Organization and China,” White House spokesman Judd Deere said at the time.