EU Commissioner Phil Hogan has said it is time for the United Kingdom to decide whether to crash out of the European Union without a deal before the end of June or to show movement in the stalled post-Brexit negotiations.

The Brexit transition began when the UK legally left the EU on 31 January and is due to conclude at the end of the year.

The UK government has repeatedly said the transition period will not be extended beyond 31 December.

Mr Hogan was speaking about many of the issues that have been on the table for a long time and which have to be resolved one way or the other if a deal is to be reached.

Speaking on RTÉ's Six One News, he said there is just one negotiating round between now and a very important high-level conference at the end of June and there needs to be movement.

He said he hopes there will be movement from the UK at that negotiating round, which takes place next week.

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Commissioner Hogan said there has been an increase in the EU's budget of over 70% for the next seven years.

In an Irish context, he said, this would mean an additional €2 billion will be available for economic recovery, a just transition fund in respect of environment and climate obligations, social funds, of liquidity businesses and the agricultural community.

Mr Hogan's comments comes as the EU's chief negotiator Michel Barnier confirmed that the EU is "open" to a two-year Brexit delay.

In a letter to the Westminster leaders of the SNP, Lib Dems, Plaid Cymru, SDLP, Green Party and Alliance Party, Mr Barnier said the option of an extension to the transition period is available if the UK wants it.

The leaders of these parties had previously written to Mr Barnier on 15 May calling for a two-year extension to be agreed between the UK and the EU amid the growing negotiations deadlock.

The SNP's Westminster leader Ian Blackford welcomed the letter and called on British Prime Minister Boris Johnson to accept the offer to help protect the economy during the coronavirus pandemic.

In his letter today, Mr Barnier said: "Such an extension of up to one or two years can be agreed jointly by the two parties.

"The European Union has always said that we remain open on this matter.

"Any extension decision has to be taken by the Joint Committee before 1 July, and must be accompanied by an agreement on a financial contribution by the United Kingdom."

Responding to the letter, Mr Blackford said: "Boris Johnson must finally put his responsibilities to jobs, living standards and the economy first - and urgently agree the two-year extension on offer to the transition period.

"It would be madness to pile a Brexit crisis on top of the coronavirus crisis we already face - with unemployment soaring, businesses shedding jobs, and many struggling to survive.

"Time is running out. There is just a month left to agree an extension to prevent the UK crashing out with a devastating bad deal or a catastrophic No-Deal.

"If the Prime Minister fails to agree an extension he will be responsible for every job lost, every income slashed, and every business that goes under as a result of his bad Brexit deal."

Mr Johnson will meet EU leaders next month in a bid to reinvigorate the negotiations that London said must finish by the end of year even if no deal is reached.

Britain officially left the European Union in January but still trades with other nations as if it were a member of the bloc.

London and Brussels must still agree on everything from fishing rights to state aid rules and environmental standards to avoid a chaotic breakup that might hurt workers and frighten financial markets.

Mr Johnson's chief negotiator David Frost reaffirmed to UK politicians today that Britain had no intention of asking for more time despite fundamental differences in the sides' positions.

"The firm policy of the government is that we will not extend the transition period, and if asked, we will not agree to it," Mr Frost told a video conference.

"I think that we will always put a lot of emphasis on economic and political freedom at the end of this year and thus avoiding ongoing significant payments into the EU budget."

Brexit dominated British politics and frustrated EU officials for years after the seismic 2016 EU membership referendum - won against the odds by the Brexit camp championed by Mr Johnson.

But the coronavirus pandemic has put EU-UK talks on the back-burner.

Mr Frost and his EU counterpart, Mr Barnier, developed Covid-19 and Mr Johnson himself was hospitalised for the virus in April.

The three have since recovered and the sides concluded a third round of video conference talks this month.

"We are perhaps a little bit behind where we would like to be otherwise, but only by a week or two," Mr Frost said.

He said Mr Johnson would join the talks before the June deadline for a summit that could determine whether Britain simply splits from the other 27 nations without a trade deal in 2021.

"The expectation on both sides is that these are done at leader level," Mr Frost said.

"And, therefore, yes, the prime minister would attend."