![What is Article 16 and why did the EU make a U-turn after triggering it?](https://cdn.newsserve.net/en/knowledge/European-Union_20190129.jpg)
What is Article 16 and why did the EU make a U-turn after triggering it?
A row over COVID vaccine supplies prompted the EU to use the "nuclear" option of invoking Article 16 - but then it quickly changed course, so what is it all about?
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