Russia GRU claims: UK points finger at Kremlin's military intelligence
The UK government has accused Russia's military intelligence service of being behind four high-profile cyber-attacks.
The National Cyber Security Centre says targets included firms in Russia and Ukraine; the US Democratic Party; and a small TV network in the UK.
A Russian foreign ministry spokeswoman described the accusation as a "rich fantasy of our colleagues from Britain".
World Anti-Doping Agency computers are also said to have been attacked.
Files later emerged showing how British cyclists Sir Bradley Wiggins and Chris Froome had used banned substances for legitimate medical reasons.
At the time, some of the attacks were linked to Russia - but this is the first time the UK has singled out the GRU, the Russian military intelligence service.
British police think the men who carried out the Salisbury poisoning in March worked for the same group.