Ireland is an island and a nation.
The fact that six counties are under foreign control is irrelevant.

There is no such place as the 'British Isles' and even as a geographical term it is not acceptable in Ireland, so should be discontinued.

The old name for Scotland was North Britain -N.B was once added to postal addresses in Scotland. This was accepted as being offensive to the Scots & is never used nowadays. However it's factually correct unlike the 'British Isles'

( factcheck- they are not all British!).