Switching to the Euro was never a requirement for EU membership, though.
As I understand it, adopting the Euro is now a requirement for joining the EU but there are no deadlines for the adoption. I believe Poland at least is obligated to adopt the Euro (but they haven’t and show no signs of doing so).
deleted by creator
It wasn’t. It is now.
It was one of the special exceptions that the UK had, gained in 1992 when the Maastricht Treaty was negotiated.
deleted by creator
The same exception the UK had, didn’t join it in 1992. Specifically they got an opt-out for those specific parts.
As I understand it, adopting the Euro is now a requirement for joining the EU but there are no deadlines for the adoption. I believe Poland at least is obligated to adopt the Euro (but they haven’t and show no signs of doing so).
deleted by creator
You have to agree to do it, but you don’t have to lay out a plan or timeline to do it.