Observers are divided over whether the security issues at Northern Ireland's newly erected port-based Border Control Posts can be resolved or not, and what these problems mean for the future of the Brexit trade deal between the UK and the EU.
Northern Ireland's Department of Agriculture held consultations with police on Tuesday after withdrawing staff from customs inspection duties at ports a day earlier over the appearance of threatening graffiti and suspicious individuals taking down the license place details of employees of port facilities.
Following the meeting, Assistant Chief Constable Mark McEwan expressed concerns "about signs of tension within the community in recent weeks", saying police are investigating "graffiti at various sites and other forms of intimidation on social media".
The police official stressed that an anonymous tip about possible "paramilitary involvement in threats" has yet to be corroborated, noting that in the meantime, the police presence at Northern Ireland's ports had been beefed up "to reassure staff and the local community".
Loyalist leaders, who support Northern Ireland being part of the UK, have warned that the protocol threatens to upset the "delicate community balance" which exists in Northern Ireland between unionists and republicans, with Democratic Unionist Party MP Ian Paisley arguing that the protocol was "bound to end in tears and here we have society's structure falling apart".
Defective Deal?
"It's all part of a very defective Northern Ireland Protocol in the Brexit agreement, which was always going to be very controversial and difficult", Rodney Atkinson, a British academic and political economist, says of the delicate security situation at the ports.
"It's difficult to know who is more at fault, the European Union, insisting on these sovereignty-destroying regulations, or Boris Johnson for accepting them. But there's no doubt about it that Johnson is in a lot of trouble and so is the Conservative Party, if they make enemies of the Ulster unionists, which it looks like they're certainly doing", Atkinson fears.
Cabinet Office Secretary Michael Gove offered a frank admission Tuesday that the problems faced by British businesses shipping goods to and from Northern Ireland due to the complicated new customs and health regulations are not just "teething problems", as earlier characterised by Johnson, but "significant" issues "which bear on the lives of people in Northern Ireland" and require urgent attention.
Dr Keith Breen, a senior lecturer at the political science department at Queen's University Belfast, believes "widespread violence is very unlikely" over the border inspection situation, but fears attacks on port border control staff are possible, given current tensions, unless the government take steps to rein in those forces making the threats.
"The security ramifications are not very significant, in my view. However, if the suspension of border controls in Larne and Belfast is left to continue by the Northern Irish and UK political authorities, the political ramifications would be damaging. Basically, these authorities would be letting paramilitary groups dictate trade policy in Northern Irish ports. No government can or should tolerate such [a state of affairs]", Breen stresses.
For starters, the professor urges UK authorities to increase port security and protection for border agency staff. Secondly, he suggests, the government needs to "remind the paramilitaries involved of the state's coercive power".
Breen believes London, Dublin, and Brussels have a "shared vested interest" in making the Northern Irish protocol work properly. In light of this, he says, the current tensions are merely a "glitch in that process".
The Northern Ireland protocol was one of the most contentious and controversial elements of the Brexit trade deal hammered out between Brussels and the Johnson government late last year. London effectively conceded to treating the Irish Sea as the de facto customs border due to the looming possibility of a no-deal Brexit, which threatened to cause significant damage to the UK economy through new tariffs, loss of fishing rights, and problems across a broad range of areas of UK-European cooperation.