On March 30, 2026, Russia expelled a British diplomat, Albertus Gerhardus Janse van Rensburg, accusing him of economic espionage and intelligence activities that allegedly threatened the country’s security. The move, which saw the diplomat’s accreditation revoked and a two-week deadline set for his departure, marks the latest escalation in an already fraught relationship between Moscow and London, fueled further by the ongoing war in Ukraine and a series of tit-for-tat diplomatic expulsions.
The Federal Security Service (FSB), Russia’s main domestic intelligence agency and successor to the KGB, announced that van Rensburg, who served as the second secretary at the British Embassy in Moscow, had provided false information when applying to enter Russia. According to Russian state media and official statements, the FSB claimed to have uncovered an “undeclared British intelligence presence” at the embassy and accused the diplomat of attempting to obtain sensitive information about Russia’s economy during informal meetings with Russian experts.
“The FSB uncovered signs that the diplomat was carrying out intelligence and subversive activities that threaten the security of the Russian Federation,” the agency said, as quoted by several international outlets including Reuters and BBC. Russian state television even aired videos purportedly showing van Rensburg meeting contacts in Moscow restaurants and skiing near a defense ministry building, further fueling the narrative of covert espionage.
The FSB’s public warning was blunt: “In order to avoid negative consequences, including criminal liability, the FSB of Russia recommends that compatriots refrain from holding meetings with British diplomats.” The Russian Ministry of Foreign Affairs summoned Danae Dholakia, the British Chargé d’Affaires in Russia, to deliver a formal protest and reinforce the seriousness of the allegations. The ministry’s statement went further, claiming, “Russian authorities also received information indicating that this employee belonged to the British intelligence services and identified evidence of his involvement in subversive intelligence work in our country.”
This expulsion is not an isolated incident. In fact, van Rensburg is the 16th British diplomat to be expelled from Moscow in just two years, as noted by Reuters. Since Russia launched its full-scale invasion of Ukraine on February 24, 2022, diplomatic relations between the two countries have deteriorated sharply. Both sides have expelled each other’s diplomats in a series of retaliatory moves, with Russia imposing Soviet-style restrictions on British diplomatic staff, requiring notice for travel beyond a 75-mile (120-kilometer) radius from Moscow. These restrictions, reminiscent of Cold War-era controls, have made postings to Moscow among the most challenging for Western diplomats.
The British government has categorically denied the accusations. A spokesperson for the UK Foreign Office dismissed the claims as “complete nonsense,” adding, “Russia has pursued an increasingly aggressive and co-ordinated campaign of harassment against British diplomats, pumping out malicious and completely baseless accusations about their work. The UK does not stand for intimidation of British embassy staff and their families.” The Foreign Office also described Moscow’s actions as “completely unacceptable” and accused Russia of using intimidation tactics against diplomatic personnel.
The UK’s response did not stop at verbal rebukes. In a tit-for-tat move, Britain revoked accreditation for a Russian diplomat and a diplomatic spouse, reinforcing its refusal to tolerate what it called harassment and intimidation of its embassy staff. This ongoing cycle of expulsions and counter-expulsions has become almost routine, but each incident adds another layer of tension to an already volatile relationship.
For its part, Russia has long complained that its diplomats face harassment and surveillance in Western capitals, particularly in the United States and the United Kingdom. Russian officials have accused British intelligence of launching espionage activities “at a level unseen since the depths of the Cold War,” aiming to sow discord within Russia. Russian state media often portrays Britain as “public enemy number one,” with the phrase “Perfidious Albion” making regular appearances in broadcasts that accuse London of scheming to undermine Russian interests worldwide.
Amid these accusations, the FSB has taken the unusual step of warning Russian citizens to avoid contact with British diplomats altogether, suggesting that any such meetings could result in negative consequences, including potential criminal liability. This marks a significant hardening of Moscow’s stance and reflects the deep mistrust that now characterizes UK-Russia relations.
Western diplomats posted to Moscow have described the environment as one of constant surveillance and harassment. The so-called “Moscow Rules”—an informal guide developed by Western intelligence services during the Soviet era to help operatives avoid detection—have been updated for the modern era. According to Sky News, these rules are now more relevant than ever, as diplomats must navigate a city bristling with electronic surveillance, informants, and a political climate that sees foreign embassies as potential nests of spies.
Since the beginning of the Ukraine war, Russia has intensified efforts to suppress opposition and rally domestic support, often painting Western nations as hostile actors bent on destabilizing the country. The Kremlin’s narrative holds that British intelligence, in particular, is orchestrating covert operations, cyberattacks, and sabotage campaigns not only within Russia but across the Western world. This rhetoric serves both as a justification for domestic crackdowns and as a rallying cry for national unity in the face of perceived external threats.
Meanwhile, the United Kingdom views Russia as its most immediate security threat. British officials have repeatedly accused Russian intelligence of conducting major cyberattacks, targeted killings, and sabotage operations throughout Europe and beyond. The mutual suspicion has only grown as the conflict in Ukraine drags on, with both sides trading accusations of meddling, subversion, and espionage.
The expulsion of van Rensburg and the stern warnings issued by the FSB underscore just how far relations have deteriorated. With both countries digging in their heels and using diplomatic expulsions as tools of statecraft, the prospects for a thaw appear dim. The standoff has left embassy staff on both sides operating under a cloud of suspicion, their movements restricted and their work scrutinized as never before.
As the war in Ukraine continues and the rhetoric grows ever more heated, the latest diplomatic row serves as a stark reminder of the perils and complexities of modern statecraft. For now, the expulsion of yet another diplomat is just one more sign that the chill between Moscow and London shows no sign of lifting.