Northern Ireland's rival parties on Friday said they would back a new power-sharing deal to revive its devolved government for the first time since 2017 and help the volatile province handle the pressures of Brexit.

Republicans and unionists were being pushed into an agreement by the threat of a new regional election if they missed a looming deadline on Monday.

The UK government in London promised a large cash infusion into the tiny but strategically vital region if the pro-Irish republican Sinn Fein and the Democratic Unionist Party (DUP), which favours continued ties to Britain, came to terms.

"Sinn Fein has taken the decision to re-enter the power-sharing institution and nominate ministers to the power-sharing executive," party leader Mary Lou McDonald told reporters.

"We're ready to do business," she added.

DUP leader Arlene Foster earlier called the draft agreement "fair and balanced".

"This is a deal that recognises that we live in a shared society, this is a deal that recognises that no one identity should be placed over another," she told BBC radio.

"We are ready to go back into the Assembly."

The region's devolved assembly at Stormont collapsed in January 2017 over a scandal caused by the runaway costs of a renewable energy scheme.

Numerous rounds of increasingly acrimonious negotiations failed to reach a solution and basic services were left unattended - eventually sparking workers' strikes.

The latest talks were launched in the wake of a December 12 UK general election that saw the pro-British Democratic Unionist Party (DUP) and the pro-Irish republican Sinn Fein lose votes to smaller groups.

Analysts attributed the main parties' losses to voter frustration at their inability to reach a compromise that could let a government in Belfast take care of the region's daily needs. A 1998 peace accord that ended three decades of violence over British rule of Northern Ireland in which thousands died requires the two main parties to share power.

The lack of an executive is especially fraught with danger for the region because of historic changes to its trade rules being imposed by Britain's pending withdrawal from the European Union.

Northern Ireland's border with the Republic of Ireland to the south provides the only UK-EU land frontier.

UK Prime Minister Boris Johnson's EU withdrawal agreement puts pressure on local authorities to maintain frictionless trade while preserving an open border on the island of Ireland.

Negotiations to revive Stormont have been stuck on disagreements over the use of the Irish language and a mechanism giving minority governments veto rights.

The draft requires the executive "to provide official recognition of the status of the Irish language in Northern Ireland" and "respect the freedom of all persons... to choose, affirm, maintain and develop their national and cultural identity".

It also eliminates the veto mechanism and compels the parties to build consensus on issues of dispute.

The UK government additionally promises to deliver a new financial package for the region that allows outstanding public sector salaries to be paid.

Downing Street called the draft deal "a balanced package" and that the precise amount of new funding would be spelled out when agreement was reached.