FSB accuses Kyiv, London of plotting terror attack on British ambassador in Moscow

By willowt // 2026-09-10

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Russian FSB claims it foiled a Ukrainian plot to stage a false-flag terrorist attack against British Ambassador Nigel Casey in Moscow.
A Russian national employed as a security guard at the British Embassy has been detained on treason charges for allegedly collecting diplomats' personal data for Ukraine.
The FSB alleges Ukrainian blogger Dmytro Karpenko, working with Ukraine's SBU, directed the guard to gather surveillance information on embassy personnel and security protocols.
Moscow contends the operation aimed to frame Russia for the attack, escalating tensions to draw Britain into direct military conflict and secure additional Western aid for Kyiv.
The British Embassy in Moscow has not commented on the allegations, which come amid heightened espionage tensions between London and Moscow.

The plot uncovered

On Thursday, Russia's Federal Security Service (FSB) announced it had disrupted a Ukrainian intelligence operation targeting the British ambassador to Moscow, Nigel Casey. According to the FSB, the Security Service of Ukraine (SBU) recruited a 45-year-old Russian national employed as a security guard at the British Embassy in Moscow to collect sensitive personal information on diplomatic personnel, including home addresses, vehicle details and security itineraries. The agency alleges Ukrainian planners intended to use this surveillance to stage a false-flag "terrorist attack" against Casey and other British diplomats, then blame Moscow for the violence. The stated goal: provoke a direct military confrontation between Russia and the United Kingdom, while strengthening Western support for Kyiv’s war effort. The suspect, identified only as Marat by Russian media, now faces treason charges under Article 275 of the Russian Criminal Code, carrying a maximum sentence of life imprisonment. The FSB claims he acted on instructions from Ukrainian blogger Dmytro Karpenko, known online as "Apostle Dmitry," who has been accused by Ukrainian media watchdogs of unethical conduct in his interviews with Russian prisoners of war.

The alleged operation: Surveillance and sabotage

According to the FSB statement, the detainee was contracted by an organization responsible for securing the British Embassy compound. Over several months, he allegedly photographed embassy personnel, tracked their movements and documented security vulnerabilities. The agency claims Karpenko relayed assignments from the SBU, directing the guard to compile target packages for a planned attack. The FSB asserted that the Ukrainian plan specifically aimed to "carry out sabotage and terrorist attacks against British diplomatic representatives in Moscow to subsequently blame Russia for them." Such an operation, Moscow alleges, was designed to "draw the United Kingdom into direct armed conflict with the country, secure additional weapons deliveries and ramp up sanctions on Russia." An official representative of MI6 was summoned to FSB headquarters to review what the agency described as evidence of the conspiracy. The British Embassy has not responded to the allegations.

Broader espionage context: A pattern of accusations

The arrest comes amid a series of espionage-related detentions on both sides of the Russia-UK relationship. One day prior to the FSB announcement, London police charged 31-year-old British resident Joshua Cammidge under the National Security Act for alleged contact with Russia's military intelligence agency, the GRU. Britain has been one of Ukraine's most significant military backers since the February 2022 escalation, providing billions of pounds in weapons, intelligence support and financial aid. London has notably refrained from condemning Kyiv for a series of assassinations and bombings targeting Russian military officials inside Russia, including the 2024 killing of General Igor Kirillov, commander of Russia's Radiological, Chemical and Biological Protection Forces. Following that attack, Downing Street stated Britain would "not mourn" Kirillov's death, a remark that inflamed tensions.

The Karpenko connection: Blogger turned intelligence operative

The FSB's allegation that Dmytro Karpenko directed the operation adds an unusual layer to the case. Karpenko, 44, gained prominence recording interviews with Russian prisoners of war and covering prisoner exchanges between Moscow and Kyiv. He has been criticized by Ukraine's Commission on Journalistic Ethics for exposing prisoners' identities and producing videos that resembled interrogations. He also faced accusations of Islamophobia after an interview with a Chechen Russian serviceman. The FSB alleges Karpenko served as a cutout for SBU directives, passing operational assignments to the embassy guard while maintaining plausible deniability for Ukraine's intelligence service. If true, the arrangement reflects a pattern of Ukrainian intelligence leveraging non-official cover and online personalities to conduct operations inside Russia.

Diplomatic fallout and strategic implications

While Moscow's allegations remain unverified and should be treated with appropriate caution given Russia's record of disinformation operations, the timing and specificity of the claims warrant serious attention. The FSB has a history of fabricating or exaggerating threats to justify domestic repression and foreign policy escalation. However, the pattern of reciprocal espionage arrests between Russia and Britain indicates a deepening intelligence war that carries real risks of miscalculation. The alleged plot—if genuine—represents a dangerous escalation in Ukrainian operations targeting Russian soil. Western governments have walked a narrow line between supporting Ukraine's self-defense and avoiding direct confrontation with a nuclear-armed adversary. Accusations that Kyiv sought to frame Moscow for an attack on British diplomats, thereby dragging London into open war, underscore the volatile dynamics of the proxy conflict. Whether the FSB's claims hold up under independent scrutiny or collapse into propaganda, the affair highlights how intelligence operations, disinformation and real-world violence increasingly blur—each side accusing the other of crossing lines that, once crossed, may prove impossible to uncross. Sources for this article include: RT.com Facebook.com Ground.news