Brian Renaghan, stands next to the Irish border which splits his farm into two, one half in County Armagh in Northern Ireland of the United Kingdom and the other in County Monaghan in the Republic of Ireland on March 19, 2019. The looming possibility of a hard Irish border that could be created by Brexit causes agony to people in Derry, a border city in Northern Ireland not unfamiliar with dark days of division and violence. (Xinhua/Han Yan)