"The agreements, which come at a time when the Delta variant is posing a rising risk to health systems, will begin to make 110 million doses immediately available to participants of the COVAX Facility, with options for additional doses," GAVI said.
The WHO said last month it was reviewing a proposal by an unidentified vaccine manufacturer in Vietnam to become an mRNA-based COVID-19 vaccine technology hub in the Southeast Asian country.
On Wednesday, the war-torn northwest of the country had received 53,800 AstraZeneca doses from Covax, the first such delivery to the country's last major opposition bastion.
India's move will affect supplies to the GAVI/WHO-backed global COVAX vaccine-sharing facility, through which 64 lower-income countries including Indonesia are supposed to get doses from SII.
"This definitely will affect (the vaccination process) because in April we only have around 7 million doses from Sinovac," Budi said.
The contribution consists of a 300 million euro grant and 200 million euros in guarantees by the European Fund for Sustainable Development plus (EFSD+) that will back a loan by the European Investment Bank.
They are targeting to deliver 1.3 billion doses of COVID-19 vaccines to 92 low- and middle-income countries by the end of 2021.