Preliminary details of the U.S. shipping 80 million COVID-19 vaccines overseas to help fight the ongoing pandemic were revealed by U.S. President Joe Biden on Thursday.

A statement from Biden spoke about how the first 25 million of those vaccines will be allocated to prepare for increased global coverage and tackle real and potential surges, in addition to addressing high burdens of disease, and the needs of the most vulnerable countries.

"At least 75 percent of these doses—nearly 19 million—will be shared through COVAX, including approximately 6 million doses for Latin America and the Caribbean, approximately 7 million for South and Southeast Asia, and approximately 5 million for Africa, working in coordination with the African Union and the Africa Centres for Disease Control and Prevention. The remaining doses, just over 6 million, will be shared directly with countries experiencing surges, those in crisis, and other partners and neighbors, including Canada, Mexico, India, and the Republic of Korea," the statement said.

Biden added that the sharing of the vaccines was being done for the greater good and not to "secure favors or extract concessions."

"We are sharing these vaccines to save lives and to lead the world in bringing an end to the pandemic, with the power of our example and with our values," the statement added.

On Monday, Biden said his administration would send at least 20 million doses of the Pfizer, Moderna and Johnson & Johnson vaccines, in addition to 60 million AstraZeneca doses he had already pledged to give to other nations.

The Biden administration has been under pressure to share vaccines to help contain worsening outbreaks from India to Brazil, where health experts fear new, more contagious COVID-19 variants could undermine the effectiveness of available shots.

(With input from agencies)