The UK has said it was "disappointing" that the European Commission has launched new legal proceedings over London's failure to implement Brexit terms to govern trade with Northern Ireland.
The commission launched four new legal proceedings against the UK after the House of Commons cleared a bill to scrap some of the rules governing post-Brexit trading arrangements for the North.
"A legal dispute is in nobody's interest and will not fix the problems facing the people and businesses of Northern Ireland," a UK government spokesperson said, adding that London would review the EU's arguments "and respond in due course".
The commission, which oversees EU-UK relations, said Britain's unwillingness to engage in meaningful discussions on the protocol governing those trading arrangements and the House of Commons' passage of the Northern Ireland Protocol bill undermined a spirit of cooperation.
It brings to seven the number of "infringement procedures" the European Commission has launched over what it sees is Britain's failure to respect Northern Ireland trade aspects of the Brexit divorce deal agreed by both sides.
The procedures could result in the European Court of Justice (ECJ) imposing fines, although this would likely not happen for at least a year.
London has proposed scrapping some checks on goods from the rest of the UK arriving in Northern Ireland and challenged the role of the ECJ to decide on parts of the post-Brexit arrangement agreed by the EU and Britain.
The four new legal procedures do not relate to Britain's new plans, but to its accusation that Britain has not implemented the protocol.
Northern Ireland is in the EU single market for goods, meaning imports from the rest of the UK are subject to customs declarations and sometimes require checks on their arrival.
The arrangement was set to avoid reinstating border controls between Ireland and Northern Ireland, but has inflamed unionist parties.
Specifically the commission charged Britain with failing to comply with customs requirements for goods moving from Northern Ireland to Britain, not transposing EU rules on excise duties in general and duties on alcohol and not implementing EU rules on sales tax for e-commerce.
The commission has given Britain two months to respond.