The DUP hit out yesterday after Michelle O'Neill blamed the Conservative party for Northern Ireland's continued lack of government.
On Thursday night the Sinn Fein vice president revealed that she had held talks with the Northern Ireland Secretary of State Karen Bradley about the ongoing stalemate at Stormont.
In a tweet, she claimed it was "abundantly clear" the British Government was "continuing to prioritise their own selfish interests over devolved government".
"DUP agenda being facilitated. The price of the DUP/Tory Pact - No Assembly or Executive," she added.
However, DUP MLA Simon Hamilton pointed to the funding secured by his party through the confidence and supply deal brokered with the Tory minority government.
He said: "For over 500 days, Sinn Fein have refused to restore devolution and nominate Executive ministers.
"In that period Sinn Fein's list of demands and red lines grew.
"Meanwhile they have allowed departments and the people of Northern Ireland to continue in a state of limbo. The latest statement from Michelle O'Neill appears to be the most bizarre assertion yet. Make no mistake the DUP were ready 541 days ago to form an Executive."
Mr Hamilton claimed that the "true price" of their confidence and supply agreement was "£1bn more for public services; the maintenance of the winter fuel payment and pensions triple lock; City Deals and much more".
"Sinn Fein have since offered scorn for extra funding for departments and have continued to boycott Stormont, the Executive and Westminster."
He added: "Sinn Fein attempts to mask their failure to deliver with outrageous statements indicates that they have no intention of putting the interests of the people above their narrow political agenda."