Tribalism has not faded over the past decade. Instead, new research reveals our politics has become ever-more polarised and fractious, says Guardian columnist Aditya Chakrabortty ...
Relations with Britain have improved again since Brexit, but battles over Irish history remain visible in Stormont's endless feuding, says Rory Carroll, the Guardian's Ireland correspondent ...
Editorial: The president's outbursts on allies and Nato were further confirmation that Europe cannot wait to bolster security - and Britain must play its part ...