Mark Bullen, a 45-year-old former Hertfordshire Constabulary police officer, has become the first British-born individual to lose UK citizenship over alleged links with Russia, a move that has sparked debate and drawn attention to the government’s rarely used deprivation powers. The decision, announced in April 2026, was made by Home Secretary Shabana Mahmood on the grounds of national security, propelling Bullen’s case into the national spotlight and raising questions about the balance between liberty and security in the United Kingdom.
This extraordinary step is typically reserved for those accused of terrorism or dangerous organized crime. According to The Times and Daily Mail, only two other individuals—both foreign-born—are believed to have had their British citizenship removed over suspected Kremlin links. Bullen’s case stands out not only because he is British-born, but also because of the secretive nature of the evidence and the high-profile circumstances surrounding his detention and subsequent loss of nationality.
Bullen’s journey from decorated police officer to stateless figure began long before the government’s decision. Having served more than a decade with Hertfordshire Constabulary, Bullen was recognized for his service, receiving two commendations and being named officer of the year. He described Russia as his “childhood love” and, in interviews with Russian media, admitted that his fascination with the Soviet Union led family and friends to jokingly call him a spy as a child. For Bullen, obtaining Russian citizenship in 2022 was, in his words, a “lifelong dream.” He relocated to St Petersburg and, until late 2024, regularly visited the UK to see family, finding travel “easy.”
Everything changed in November 2024. Upon flying into Luton Airport from Russia, Bullen claims he was forcibly detained under terrorism legislation. He recounted that his electronic devices were seized and that he was questioned for four hours, with much of the interview focused on the 2018 Salisbury poisonings—a notorious case that has continued to cast a shadow over UK-Russia relations. Bullen has never been charged with any crime, and he maintains that his police record remains unblemished.
During his police career, Bullen’s engagement with Russia was not hidden. He met senior Russian officers and participated in a month-long exchange program in St Petersburg, experiences that were, at the time, considered part of routine international cooperation. However, as tensions between the UK and Russia escalated in the years following the Salisbury incident, such connections began to attract greater scrutiny.
The Home Secretary’s decision to revoke Bullen’s citizenship was justified on the grounds of national security, but the precise evidence underpinning the move has not been disclosed. Mahmood stated that the material supporting her ruling “should not be made public in the interests of national security.” The Home Office echoed this stance, emphasizing that deprivation of citizenship is a vital tool to protect the UK from “some of the most dangerous people, including those involved in terrorism, hostile state activity, or serious organised crime.” According to Express, the department insisted, “Deprivation decisions are never taken lightly, but this government will always take whatever action is necessary to keep our country safe.”
Bullen, for his part, vehemently denies any wrongdoing. In comments given to the Daily Mail last year, he declared, “I absolutely deny I am any threat to the UK. I find that comical.” Expressing disbelief at the government’s actions, he added, “I find it hard to believe that a country like England, which is supposed to be about freedom and liberty, would behave in this way. I have never been charged. I have a perfect police record, two commendations, I was awarded officer of the year.”
The secrecy surrounding the government’s evidence has fueled speculation and concern among legal experts and civil liberties advocates. Critics argue that the lack of transparency undermines the principle of due process and leaves the accused with limited avenues to challenge the decision. While the Home Office maintains that national security considerations justify withholding details, the case has raised uncomfortable questions about the threshold for such a drastic measure and the safeguards in place to prevent potential abuses of power.
Bullen’s case also highlights the evolving landscape of national security in the UK. In recent years, the government has expanded its use of citizenship deprivation powers, particularly in response to perceived threats from terrorism and hostile state actors. The inclusion of individuals suspected of links to foreign governments—especially in the context of strained relations with Russia—marks a significant shift in policy. As Fakta reported, Bullen’s legal status and potential avenues for appeal remain uncertain, underscoring the unprecedented nature of his situation.
For many, the story is as much about the broader political climate as it is about one man’s fate. The 2018 Salisbury poisonings, which saw the use of a nerve agent on British soil, have left an indelible mark on UK-Russia relations and continue to inform government policy. The willingness to revoke citizenship on the basis of suspected Kremlin ties—even in the absence of criminal charges—reflects the heightened sense of vigilance that now permeates official thinking.
Supporters of the government’s approach argue that national security must take precedence, especially in an era of increasingly sophisticated threats. They point to the need for robust tools to counter espionage, cyberattacks, and other forms of hostile activity. The Home Office’s statement that “the government will always take whatever action is necessary to keep our country safe” resonates with those who see the deprivation of citizenship as a necessary, if regrettable, part of modern security policy.
Yet, for others, the case is troubling. The prospect of losing citizenship—one of the most fundamental rights—without the opportunity to see or challenge the evidence is, for many, a step too far. Bullen’s assertion that he poses no threat, coupled with his unblemished record and history of public service, has prompted calls for greater oversight and transparency in the use of such powers. Some legal analysts have warned that the precedent set by this case could have far-reaching implications for civil liberties in the UK.
As of now, what happens next remains uncertain. Bullen’s options for appeal are unclear, and the government has given no indication that it intends to release further details. The case will likely continue to attract attention from both the public and legal experts, serving as a touchstone for debates over security, liberty, and the limits of state power.
For Mark Bullen, the personal cost is immense. Once a decorated officer, now a man without a country, his story is a stark reminder of the tensions at the heart of national security policy in a turbulent world.