While some in May's Conservative Party are unhappy at Monday's DUP deal, fearing it could imperil the 1998 peace settlement between Protestants and Catholics in Northern Ireland, leaders in Scotland and Wales asserted that it could compromise the make-up of the United Kingdom itself.
"Today we have reached an agreement with the Conservative Party on support for the government in Parliament".
There will be one billion pound extra for Northern Ireland over the next two years.
May and Democratic Unionist Party (DUP) leader Arlene Foster presided at the signing of a three-page so called "confidence and supply" deal at Downing Street on Monday (Tuesday NZ Time) that is some way short of a more formal coalition agreement.
While talks with the DUP have been in the works for several weeks and the deal comes as no surprise, many have criticized the move in light of the DUP's socially conservative positions, which have included being anti-gay marriage and anti-abortion rights.
We must hope that it has been properly fertilised and tended by the Conservative and DUP deal because everyone will be wanting a bite of its fruit.
Opponents of the deal say the British government would no longer be acting as a neutral party with regards to Northern Ireland if the DUP has an active role in government.
Democratic Unionist leader Arlene Foster said the agreement would "address the unique circumstances" of Northern Ireland.
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"The agreement makes clear that we remain steadfast to our commitments as set out in the Belfast Agreement and its successors, and in governing in the interests of all parts of the community in Northern Ireland", she said.
"We welcome this new financial support of £1 billion pounds in the next two years as well as providing new flexibilities on nearly £500 million pounds previously committed to Northern Ireland". But the money for Northern Ireland is certain to raise questions amid budget shortages.
The two parties promised to enforce it for the full length of the current parliamentary term, which is due to last until 2022. A deal with the DUP could ensure an extra 10 votes.
"Northern Ireland needs a functioning devolved government at this important time", May said in a statement.
The DUP will also support legislation on national security and Brexit.
'And, will all parts of the United Kingdom receive the much needed additional funding that Northern Ireland will get as part of the deal?'
"As a outcome, spending power of nearly £1.5billion will be available to address the unique circumstances of Northern Ireland and the effect these have had on the economy and its people".
Ms Sturgeon said that by "ignoring" the Barnett formula, Scotland would lose out on around £2.9 billion for public services while Welsh Government estimates put its loss at £1.67 billion.