The United States will spend $3.5 billion to buy and donate 500 million doses of the Pfizer COVID-19 vaccine to some of the world’s poorest countries.
It has urged other G7 nations to follow suit.
The vaccine donation - the largest ever by a single country - was announced before US President Joe Biden meets leaders of the Group of Seven advanced economies in western England.
A senior Biden administration official said the US is not seeking favours in exchange for these doses and is not imposing conditions - political or economic or otherwise on countries for receiving these doses.
The 500 million doses are destined for the world's 100 poorest countries. A senior Biden administration official described the gesture as a "major step forward that will supercharge the global effort" with the aim of "bringing hope to every corner of the world."
"We really want to underscore that this is fundamentally about a singular objective of saving lives," the official said.
US drugmaker Pfizer and its German partner BioNTech have agreed to supply the United States with the vaccines, delivering 200 million doses in 2021 and 300 million doses in the first half of 2022.
The shots, which will be produced at Pfizer's US sites, will be supplied at a not-for-profit price.
Qatar's Ministry of Defence has announced that an oil tanker was struck by a cruise missile in its territorial waters on Wednesday, with no casualties reported.
Australian Prime Minister Anthony Albanese has warned the economic shocks of the war in the Middle East would be felt for months and encouraged citizens to take public transport in a rare address to the nation on Wednesday.
An Iranian drone attack has targeted fuel tanks at Kuwait International Airport on Wednesday, causing a major fire that broke out at the site, with no injuries reported.
At least 18 people were killed when an inflatable boat carrying migrants sank off Turkey's western province of Mugla on Wednesday, the coastguard said in a statement, adding that search and rescue efforts continued in the area.
US Secretary of State Marco Rubio has said on Tuesday that Washington could see the "finish line" in the Iran war, which is now in its fifth week, and the US will have to reexamine ties with NATO after the conflict.
Bahrain's Interior Ministry has announced on Wednesday that its civil defence teams were extinguishing a fire at a company facility caused by an Iranian attack.
US Defence Secretary Pete Hegseth said on Tuesday the next few days in the war against Iran would be decisive and warned Tehran the conflict would intensify if it did not make a deal, while Iran said it will target US companies in the region from Wednesday.
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