An EU official, who asked not to be identified because of the sensitivity of the issue, confirmed a report that first appeared in the Financial Times.
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The move came at the behest of Italy, which has been taking a tough line in dealing with vaccine shortages within the 27-nation bloc since a new government led by Mario Draghi came into power last month.
Faced with shortages of doses during the early stages of the vaccine campaign that started in late December, the EU issued an export control system for COVID-19 vaccines that have to make sure that companies respect their contractual obligations to the bloc before commercial exports can be approved.
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The EU has been specifically angry with the the Anglo-Swedish company because it is delivering far fewer doses to the bloc than it had promised.
The EU has vaccinated only 8 % percent of its population compared to over 30%, for example, in the United Kingdom.