Sinn Féin has said the current phase of Northern Ireland inter-party discussions at Stormont Castle has run its course.
The party said it will not nominate its Stormont leader Michelle O'Neill as deputy first minister on Monday.
The decision means no power-sharing executive can be formed in time for Monday afternoon's formal deadline.
DUP leader Arlene Foster said to date "there was little to suggest that Sinn Fein want to secure agreement".
"The DUP stands ready to continue to discuss how we can secure new arrangements for Northern Ireland," she said.
I hope I'm wrong but I have the feeling that hypocrite and liar Gerry 'I regret every death' Adams and his gang of murderers will soon be making unacceptable demands again. We all know what happened then.
He will of course be encouraged by Sinn Fein/ IRA's previous successes in getting their own way. In case anyone's forgotten just how abjectly we rolled over then, a read of the last item in Hitchens' column in the Mail on Sunday yesterday gives an unpalatable reminder.