"The arrangements that we have put in place under the Northern Ireland protocol automatically evaporate after 4 years unless the assembly decides that they want to protract them", Johnson said.
However, the Prime Minister did not provide any figures for the amount of money to be provided by the British government to Northern Ireland. "I don't foresee any circumstances whatsoever in which there will be any checks on goods going from Northern Ireland to Great Britain", he said. North-south cooperation is going to resume.
The executive parties met Secretary of State Julian Smith to discuss funding to support a wide range of commitments, from improving nurses' pay and hospital waiting lists to protecting school budgets and welfare payments.
He said: "It's just scandalous".
Whitehall insiders yesterday said ministers and officials were preparing legislative proposals created to meet the commitments of both the manifesto and the new power-sharing agreement. "This is crucial in ensuring transformation in areas such as health and also our road and water infrastructures". "We have done our bit".
The new agreement contained provision for "proper responsibility for the use of public funds", he said.
In July previous year, the British Parliament passed legislation to bring the province into line with the rest of the United Kingdom, dictating that regulations governing same-sex marriage and civil partnerships will be made no later than 13 January, unless the devolved government was restored before 21 October.
A botched green energy scheme known as "cash for ash" that wasted hundreds of millions of pounds under Foster's watch in the previous administration may have dented her ability to squeeze money from Whitehall.
Asked about the scandal, Johnson replied: "It is vital that public spending in Northern Ireland is properly invigilated and there is no repetition of that kind of thing".
Stalled mechanisms backed by Northern Ireland's parties in a 2014 agreement are due to be implemented as part of last week's accord.
Mr Johnson held talks with Irish premier Leo Varadkar and his Foreign Affairs Minister Simon Coveney at Stormont before meeting First Minister Arlene Foster and deputy First Minister Michelle O'Neill.
He insisted he stood by the manifesto pledge to protect armed forces veterans from the 30-year conflict from unfair prosecutions without new evidence coming forward.