British Prime Minister Boris Johnson said the UK will have to act if a compromise cannot be reached with the EU regarding the deepening crisis over the Northern Ireland Protocol.
He said the UK government is open to “genuine dialogue” with Brussels before a trip to Belfast on Monday for emergency talks with parties in Northern Ireland.
He went on to say that if a deal cannot be reached with the EU, the government will set out its “next steps” in a statement to Parliament “in the coming days”.
There were reports British ministers could table emergency legislation as early as this week to override the protocol which requires customs checks on goods moving from Great Britain to Northern Ireland.
EU leaders said such a move would violate Britain’s international treaty obligations under the Withdrawal Agreement signed by Mr Johnson and would lead to retaliatory measures.
In the meantime, the power-sharing institutions in Northern Ireland remain suspended with the British loyalist DUP refusing to join Irish nationalist Sinn Fein in a new executive or to allow the election of a speaker to the assembly unless there is fundamental change to the protocol.
Writing in the Belfast Telegraph, Mr Johnson said there was still a “sensible landing spot” where the interests of all sides are protected – including the integrity of the EU single market, which the protocol is designed to maintain.
However, he said that would require movement on the part of the EU.
“We have been told by the EU that it is impossible to make the changes to the protocol text to actually solve these problems in negotiations – because there is no mandate to do so,” he said.
“We will always keep the door wide open to genuine dialogue. There is without question a sensible landing spot in which everyone’s interests are protected.
“I hope the EU’s position changes. If it does not, there will be a necessity to act.
“The government has a responsibility to provide assurance that the consumers, citizens and businesses of Northern Ireland are protected in the long-term.
“We will set out a more detailed assessment and next steps to Parliament in the coming days”.
Although the government signed up to the protocol, ministers said change is needed as the way it is operating is hurting businesses and fuelling sectarian tensions, with Unionists feeling their position in the United Kingdom is being undermined.
Earlier, however, Ireland’s Foreign Minister Simon Coveney said there would be a “consequence” if the UK took unilateral action in breach of its obligations under international law.
He said such a move would be deeply harmful to UK-Ireland relations and could “fundamentally undermine” the functioning of the institutions of the peace process in Northern Ireland.
“The last thing the EU wants, the last thing that Ireland wants, is tension with the UK, particularly at the moment given what’s happening in Ukraine, Russian aggression, and the need to work together on an international stage,” he told Sky News’s Sophy Ridge on Sunday programme.
“Unfortunately, it has been the briefings that have come from the British government this week that have raised a real red flag in Dublin and in Brussels because the British government is now threatening to break international law to break a treaty that they signed with the EU.”
But in a round of broadcast interviews with the BBC and Sky News, Business Secretary Kwasi Kwarteng hit out at “irresponsible” threats of a trade war, saying it would take “a very long time” for the EU to implement new tariffs.
“It is up to the EU. We think it would be completely self-defeating if they went into a trade war, but that is up to them,” he said.
“Any tariff situation would have to go to arbitrators. It is not something they can do willy-nilly, arbitrarily.”
Downing Street said Mr Johnson will use a series of private meetings in Belfast on Monday to deliver a “tough message” that any “fix” to the protocol must involve the parties coming together to form an executive and assembly.
He is expected to say that while the UK government will “play its part to ensure political stability”, politicians must “get back to work” so they can deliver on “bread-and-butter issues” for the voters.
Before his visit, however, Sinn Fein – which is now the biggest party in the assembly following the elections – accused the prime minister of being “in cahoots” with the DUP and supporting its “blocking tactics”.
