Troops may return to the border in the event of failed Brexit, warned the Irish Prime Minister.
Taoiseach Leo Varadkar said a tough border could include "people in uniform … possibly a police presence or an army presence to support them."
Mr Varadkar added that Ireland had been "victimized" by Brexit.
A spokesman for the Irish government later said that Mr. Varadkar was not referring to bringing Irish troops to the border and stressed that this was not planned.
"The Taoiseach made it clear in the interview that the government is determined to avoid a no-deal scenario and the resulting risk of a hard border," the spokesman said.
"He was asked to describe a hard border, and he described what she looked like before, and what risk she might have, as in the worst case scenario." He did not refer to Irish personnel, and the Irish government has no plans to station infrastructure or personnel at the border. "
The comments come as the British Chancellor told the EU. Be prepared to give up some of his" red lines "of Brexit to" save Prime Minister Theresa May struggles to achieve her withdrawal through parliament Many protest the deal because of the perseverance of Irish citizens border.
The backstop is effectively an insurance policy to a return to avoid a hard border between Northern Ireland and the Republic of Ireland, if no other solution can be found through a more extensive trade agreement with the EU. [1
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In a conversation with Bloomberg TV at the World Economic Forum in Davos, Varadkar said the restraint was necessary to halt the penetration of the visible border between Northern Ireland and the Republic of Ireland.
At present, goods and services are traded between the two jurisdictions on the Irish island with few restrictions.
This was ensured by the 1998 Good Friday Agreement, which was signed by both the Irish and British governments as well as the political parties in Ireland Northern Ireland.
Mr Varadkar said it was up to London to find a solution, adding that Dublin had been constantly asked to compromise on a number of issues.
DUP MP Gregory Campbell described Taoiseach's comments on a worst-case scenario as "profoundly unhelpful."
"While others focus on making a decent deal, the Irish are The prime minister needs to lower the rhetoric and focus on further solutions," he added.
Mr. Varadkar's allegations were condemned by Sinn Féin's President Mary Lou McDonald as "reckless and irresponsible".
"Today he paints a doomsday scenario of returning the soldiers to the border in the event of a no-deal Brexit," she said.
"If this is the case, such a scenario can only be prevented by having the Irish people speak in the form of a border survey on Irish unity."
After the interview, an Irish government spokesman switched to explaining Mr. Varadkar's remarks.
"The Taoiseach made it clear in the interview that the government is determined to avoid a no-deal scenario and the resulting risk of a hard line," the spokesman said.
"He was asked to describe a hard border, and a description of what it used to look like, and the risk of what it might look like in the worst case."
On Thursday, Mr. Varadkar said the UK would "After Brexit, trade agreements are very difficult if the Irish border problem has not been resolved."
He added that Ireland would continue to benefit from the EU's trade agreements.
In Westminster fearing opponents of the restraint system that this will not be just a temporary measure, unless future trade agreements are agreed.
Downing Street says this is one of many concerns it had to deal with and that it "is not there is, with a new backstop proposal to Brussels.
The Chancellor, Phillip Hammond, said, although he does not think that the EU abschans the restraint systems Some people in the EU have "sought what they can do" to change that in order to support Westminster settlement.
Meanwhile, the Irish Central Bank has warned that a no-deal Brexit could lead to "immense" challenges for the Irish economy.
Its first quarterly report of the year states that the economy could grow by about 4.5% this year, but that can fall to 1.5% in a no-deal scenario.
A "potentially high devaluation of sterling" and more expensive food due to tariffs is also predicted.
It is expected that the economy will eventually adjust in the long term.
"It's messy compared to a scenario where the UK has remained an EU member. A Brexit would lead to a significant and permanent loss of production in the Irish economy," the report said.
"The disruption and associated decline in economic activity would be premature and would make the Irish economy significantly worse in 2019 and 2020 than the central forecasts in this Bulletin."
"Worsening Economic Conditions"
The report the central bank suggests that "disorderly Brexit" would slow down the growth of the Irish economy over the next two years.
The Central Bank of Ireland uses 88p for the euro as sterling, but says it could fall to 96p-97p in a no-deal Brexit.
It was warned that "worsening economic conditions and unfavorable forecasts would cause businesses and households to cut spending".
Imports would be affected by disruptions in production and households would also be adversely affected by the price and availability of consumer goods.
"Exports would decline due to immediate demand and a sharp decline in demand from the UK and the British pound."
In the beginning, ports and airports would also be disturbed if the border infrastructure were not up to the new regulations.