The EU's chief Brexit negotiator has said that legal action is imminent over the UK's move to unilaterally extend grace periods on Irish Sea border checks.
Maroš Šefčovič told the Financial Times that "infringement proceedings" are being prepared.
He said: "We are currently preparing it and it would be really something coming to our table very soon."
The EU has two legal avenues open to it under the Brexit deals.
Under the NI part of the Brexit deal, the Protocol, it can launch infringement proceedings which could lead to a case at the European Court of Justice
It took this action at the time when the UK threatened to breach the NI deal through the Internal Market Bill.
In that case the legal proceedings were overtaken by political agreement.
The EU could also seek arbitration under the terms of the wider EU-UK trade deal.
https://www.bbc.co.uk/news/uk-northern-ireland-56285874