Referencing the "once in a generation" phrase used by some SNP politicians throughout the 2014 referendum, Johnson said he would uphold this "promise" made by Sturgeon and former-First Minister Alex Salmond.
'It is time that we all worked to bring the whole of the United Kingdom together and unleash the potential of this great country'.
'I can not agree to any request for a transfer of power that would lead to further independence referendums, ' Mr Johnson wrote.
The SNP now holds a slim majority in the Scottish Parliament, with 62 of the 129 seats, 31 held by the Conservatives.
Sturgeon said that the Conservatives were "terrified of Scotland's right to choose - because they know that when given the choice we'll choose independence". The SNP will be hoping to secure a majority or at least return a pro-independence majority combined with the independence-supporting Scottish Green Party.
"The problem for the Tories is the longer they try to block democracy, the more they show the Westminster union is not one of equals and fuel support for independence", Nicola Sturgeon said.
The renewed push for Scottish independence was a key policy for the SNP at last year's general election, and although Johnson's campaign was overwhelmingly fought on Brexit, his stalemate with Sturgeon now threatens to damage his leadership, YouGov researcher Chris Curtis told 9News.com.au.
In his letter to the head of the SNP, Mr Johnson said that he had "carefully examined" the case she had presented for the transfer of powers to Holyrood which would allow her to hold a vote on the future of Scotland.
Boris Johnson's stalemate with SNP leader Nicola Sturgeon now threatens to damage his leadership, analysts say.
"That would be an absolute disaster for him to finally get through these Brexit negotiations and then for his entire leadership to be thrown off track again".
Sturgeon and her party have vowed to hold another vote on independence, a promise which was given greater urgency after Johnson's election victory signaled that the United Kingdom would follow through with Brexit.
Environmental groups and Citizens Advice Scotland have called on ministers to double their investment in zero-carbon homes following a survey finding that 15 per cent of small businesses say they have not been able to implement measures to reduce their carbon footprint.
Although said to have made progress - with CIH Scotland revealing just over 50% of the overall target for completions had been met - Scottish Labour have warned that plans had been "diluted" by Housing Minister Kevin Stewart, of which only "the vast majority" of those 50,000 planned will be new-build.
"The Westminster union can not be sustained without consent".
Vainqueur du sprint vendredi, Fourcade , auteur d'un 10/10 à la carabine, a ainsi confirmé son retour en forme. Je savais que je devais terminer devant pour avoir la chance de porter à nouveau le maillot jaune.
Miss Edward was covering the devastation caused by bushfires on Kangaroo Island, off the coast of South Australia, on Saturday. He claimed: 'The 3rd most usual injury we see from visitors in Australia is in fact from a decline bear assault'.
The London Brent crude was sold for $64.63 per barrel which gained 43 cents at 0.67 percent while the U.S. Oil settled at the lowest level since early December as geopolitical tension in the Middle East eased.
To date the material, the researchers used a unique technique to measure the effects of cosmic rays hitting the grains. Last year, researchers found a new mineral from the Wedderburn meteorite that was found in Australia 70 years ago.
Records are tumbling at the MCG, with Melbourne Stars allrounder Marcus Stoinis' blasting the highest score in BBL history. The star of the game was undoubtedly Stars' opener batsman Marcus Stoinis , who played a superb unbeaten knock of 147.
Search and rescue work was underway and the cause of the accident was under investigation, the state-run CCTV broadcaster said. The bureau said the bus had been raised from the collapsed 80-square metre (860-square foot) section into which it had fallen.
Lorene Scafaria (" Hustlers ") and Marielle Heller ("A lovely day in the neighborhood") also participated in the conversation. The most likely candidate was Greta Gerwig ( Little Women ), who was the last woman nominated two years ago for Lady Bird .
Bencic advances as injured de Minaur out of Adelaide
The American, whose last match was a second-round ouster in Beijing on October 1, exited in 72 minutes, dropping serve four times. In men's play, Dan Evans beat Alexander Bublik 7-5, 6-2 and seventh-seeded Jan-Lennard Struff defeated Salvatore Caruso 6-4, 6-2.
Ireland to hold general election next month
The Saturday date comes as a surprise as many believed he would go to the country on either Friday, February 7th or 14th. It's understood the Taoiseach told his cabinet the election date during their meeting on Tuesday morning.
'Westworld' Season 3 Premiere Date Set for March
We know surprisingly little about Westworld season 3 , and that's despite there being three trailers already available to watch. What we want most from Season 3 are answers about that Season 2 post-credits scene about the Man in Black ( Ed Harris ).
AB on Proteas comeback: 'I'd love to'
Now, with the T20 World Cup in less than ten months, plans seem to be in place to facilitate his return. The right-handed batsman had announced his retirement from global cricket in 2018 owing to workload.
England, South Africa eye series win
The third test at St George's Park is followed by the last at the Wanderers in Johannesburg from Jan 24-28. Keegan Petersen, who was added as cover ahead of the Newlands Test, misses out.
Canadian economy adds 35200 jobs in December
Friday's report also showed that American women held more jobs than men in December for the first time in almost a decade. That was a 21% reduction from the 2.68 million in 2018 and placed 2019 eighth in the last decade for employment growth.