The only question is whether Brussels (the EU) will happily fire us with a mutual agreement, or force us to leave at our own risk, said the conservative ruler in two public articles in two Sunday newspapers.
Latvia's prime minister described the supply as a "basis for negotiations" however stated agreeing a deal is "fully dependent" on the desire of Mr Johnson.
On Friday, Scotland's highest civil court heard that Mr Johnson accepted he must send a letter requesting a delay to Brexit beyond the Halloween deadline if no deal is agreed with parliament by 19 October, Scotland's highest civil court heard.
Pressed on the pledge, Mr Barclay told BBC One's The Andrew Marr Show: "If a commitment is given to the court, you abide by it".
The UK has said it would work on the details before then but there was "no path" to a deal without alternative arrangements in Northern Ireland.
Johnson's op-ed appeared aimed at adding pressure on the European Union to agree to his latest Brexit proposals as the deadline nears.
In a key week for negotiations ahead of the upcoming EU leaders' summit of October 17-18, Johnson's Europe adviser David Frost will hold further discussions with the European Commission, while Brexit secretary Stephen Barclay will visit a number of EU capitals for further talks.
The Prime Minister said it was now up to the European Union - which has so far given a frosty reception to his proposal to replace the Irish backstop - to "cheerily" wave the United Kingdom "off with a mutually agreeable deal".
But a report in the Daily Telegraph said Johnson meant to challenge that law, the Benn Act, in the Supreme Court.
The British prime minister has suggested that Northern Ireland could continue to apply European Union legislation relating to agricultural and other products, but only if Assembly members provided their consent every four years.
Johnson wants Northern Ireland's devolved assembly - which has been suspended for nearly three years - to vote every four years on whether to maintain European Union rather than British regulations there. It sees the potential for rampant smuggling while Ireland is concerned hardline Northern Irish unionists would have an effective veto.
Ireland's chief Leo Varadkar claimed Saturday there is "loads of time" to place forward alternatives and he was making an attempt to arrange a meeting with Johnson subsequent 7 days, Irish broadcaster RTE documented. "We've set out a broad landing zone", he said when asked about customs checks post-Brexit.
Mr Varadkar told the Irish national broadcaster RTÉ News there was still time for the United Kingdom government to put forward further proposals.