God the reporting on this has got really nationalistic.
Nobody has said its ineffective - at least, not the EU (by which I assume you mean actual European Union officials, or the European Medical Agency, not random European leaders?)
My understanding is: - Astra Zenica sent incorrect dosage info/samples when having vaccine initially approved for us in EU, which led to delays in approval.
-There was some concern from test data about how efficient it is in older cohorts.
- In response to this, nobody wanted to stop using it: some countries used it exclusively in younger workers, where they felt it was undoubtedly efficient.
- There were some worrying and anomalous potential side effects reported a few weeks ago, causing to a number of countries worldwide (some European, some not) to temporarily pause distribution. Now further investigation has been done, its been reinstated in less than two weeks.
I'm in Ireland, think the export ban stuff has been very badly handled but find the UK reporting a bit horrifying. Our government has been trying to buy up these 'stockpiled' European supplies of AZ nobody is using: turned out they don't actually exist. I think the principle of investigate side effects and be sure is very helpful. We don't give AZ to over-70s, but we have used it extensively to vaccinate our healthcare workers.
And to be honest, I do think AZ seems to have somewhat shafted the EU with their supply vs contract, for whatever reason, but its a company. Not even a 100%. british company. So the weird equating antipathy towards AZ supply chain with hatred of the British isn't something I've seen outside the Daily Mail.