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No they don't care. But breaking an international agreement and pissing of ROI is one guarantee to get blocked by anybody bar total banana republics.
ROI has links with the USA, as loads of Irish people went there in the past. So now you have the orange baboon and that.
The EU will be ultra pissed.
I am not sure the ex colonies have full trust in the UK [see the new zealand lamb debacle when the UK joined the EEC] and that won't help.Only a total moron would do that. Even May is not THAT dumb.
And you think a majority in government or the population outside of NI cares why? Let's face it, the rest of the 'United Kingdom' very much likes to entirely disregard NI, its interests, or even its existence when there isn't a good reason to remember it.