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"I think the British noticed that ... it's changing with the US, they aren't quite as close as before," he said. "And now they aren't going to be EU members either, and the EU has made it clear that things won't be the same."
"There is a certain nervous realisation of loneliness there," he added. "But from all that I see and hear, I don't currently see a path or a possibility of going back on (Brexit)."
Maas added that he had welcomed the continuing close cooperation between Britain, France and Germany over Europe's response to the United States' decision to pull out of the Iran nuclear deal.