Russia has lost 500,000 soldiers since its full-scale invasion of Ukraine began in 2022, according to the head of GCHQ, the UK's intelligence agency. Anne Keast-Butler gave the figure during her first public speech at Bletchley Park, stating that it proved Vladimir Putin was “going backwards on the battlefield”.
Ms Keast-Butler warned that Russia was risking a wider conflict in Europe by targeting critical infrastructure and supply chains across the continent. She accused Moscow of “scaling up its daily hybrid activity against the UK and Europe”, including espionage plots in multiple countries.
Western intelligence and independent analysts estimate that both Russia and Ukraine have suffered hundreds of thousands of military casualties, with Moscow's losses significantly higher than Kyiv's. An estimate by exiled Russian media outlets Meduza and Mediazona suggested nearly 352,000 Russian soldiers had been killed by the end of 2025. Ukraine's President Volodymyr Zelensky said in February that Ukraine had lost 55,000 soldiers.
Ms Keast-Butler also highlighted the threat of artificial intelligence, describing it as “an unstoppable force” being weaponised just below the threshold of traditional warfare. She noted that Russia and China were investing heavily in AI for military and other purposes, and that both countries had been accused of cyberattacks and sabotage—accusations they deny.
European leaders from Poland, Sweden, Norway and Lithuania have blamed Russia for a series of alleged aggressions since the war began. Ms Keast-Butler stressed the need for businesses to take cybersecurity seriously, saying it was “a critical priority” for the defence of the nation and the economy.
