Sinn Féin president Mary Lou McDonald has said it is time for the DUP to decide on whether it intends to return to power-sharing at Stormont.
Ms McDonald was speaking as a party delegation went into Hillsborough Castle for talks with Northern Secretary Chris Heaton-Harris on the terms of a financial package for a new Stormont Executive.
Some £2.5bn (€2.9bn) has been offered by the British government if devolution can be restored.
The political parties have been negotiating the terms for the past three days.
Ms McDonald said a decision would now have to be made by the UK Treasury on the additional sums requested by the political parties and by the DUP on whether to go back into government.
"We need a positive response from the DUP to get the institutions back up and running. It really is as simple as that.
"This is the moment now for decisions to be made. It is a moment of truth, and I hope that it will prove to be a moment where at very significant decisions can be taken by all concerned."
Emerging from talks on the proposed financial package for a restored Stormont Executive, DUP leader Jeffrey Donaldson said he wanted to see the UK government deliver on commitments to ensure Northern Ireland's place in the UK and it's single market.
"I'm not interested in choreography. I'm interested in results," he said.
"I'm interested in solutions, and we will keep working on this until we get the outcome that Northern Ireland needs."
The political parties will return for more talks next week about the detail of the financial package to accompany a restored Stormont Executive.
Northern Secretary Chris Heaton Harris said the "single focus" of discussions around the money next week would be on the restoration of devolution.
Tánaiste and Minister for Foreign Affairs Micheál Martin expressed a hope to party colleagues this evening that agreement can be reached within the next few days.
Sunak ready to legislate over Northern Ireland's place in UK
British Prime Minister Rishi Sunak has said that he was prepared to legislate to guarantee Northern Ireland's place within the UK and its internal market, as efforts to restore power sharing at Stormont continue.
Mr Sunak made the comments during Prime Ministers' Questions in the House of Commons today.
He was answering a question from Mr Donaldson.
The DUP pulled out of power sharing over unionist concerns about the impact of post-Brexit trading arrangements.
Mr Donaldson told the Commons that the UK prime minister was well aware of unionist concerns about the "need to remove the Irish Sea border created by the protocol" which he said disrupted the UK's internal market.
"Will the prime minister bring forward legislation to amend the UK Internal Market Act and both guarantee and future proof Northern Ireland's unfettered access to the UK's internal market in all scenarios?" he asked.
In reply, Mr Sunak said he recognised the need to do more to address unionist concerns.
"I can confirm to him that the government does stand ready to legislate to protect Northern Ireland's integral place in the United Kingdom and the UK's internal market alongside an agreement to restore the Executive.
"We can do this at pace and I know my right honourable friend and his colleagues are working hard to achieve that. Our NHS, our police officers and the most vulnerable in Northern Ireland need devolved government urgently and I think it's incumbent on all of us to work day and night to help achieve that."
Such legislative guarantees are a key ask of the DUP as it decides whether to return to power sharing.
