Sinn Fein's Michelle O'Neill has insisted Arlene Foster personally handed her a draft deal to restore powersharing in Northern Ireland just days before the DUP leader pulled the plug on talks.
Mrs O'Neill was responding to a leaked email between senior DUP and Sinn Fein aides that said Mrs Foster passed her a hard copy of a proposed agreement on February 9, five days before her party's Valentine's Day walkout.
The email exchange, published last week by news website EamonnMallie.com, appears to counter the DUP's continued insistence that it had not agreed the framework of a deal with Sinn Fein that would have seen devolution return to Stormont.
The party has been accused of getting cold feet in the face of an internal revolt from grassroots members angry about potential concessions to Sinn Fein on the vexed dispute over the Irish language.
Senior DUP figures have rubbished the claims. MP Gregory Campbell has claimed no draft deal existed and deputy leader Nigel Dodds said the suggestion Mrs Foster had passed a hard copy to Mrs O'Neill was "news to me".
Mrs O'Neill was asked about the claim after holding talks with EU Brexit negotiator Michel Barnier in Brussels on Monday.
"I can confirm that Arlene Foster did hand me a hard copy of a document which was then subsequently emailed to Stephen McGlade who works with me in the office," she said.
She added: "It was a culmination of a lot of work, it was the outworking of all the negotiation which we participated in in good faith and to me when she handed me the document that was in fact the draft agreement in which we were working on.
"We know where we had got to, we had after 14 months found a way forward, there was a basis to restore the institutions.
"So only the DUP leadership, and whoever is in charge of the DUP, can talk about who actually and why they failed to close the deal.
"I am 100% sure, I am crystal clear that we had a draft agreement and had found a way forward."