Britain, the United States and Canada accused Russia of trying to steal information from researchers seeking a COVID-19 vaccine.
The three nations alleged that hacking group APT29, also known as Cozy Bear and said to be part of the Russian intelligence service, is attacking academic and pharmaceutical research institutions involved in coronavirus vaccine development.
"It is completely unacceptable that the Russian Intelligence Services are targeting those working to combat the coronavirus pandemic,'' Foreign Secretary Dominic Raab said in a statement.
"While others pursue their selfish interests with reckless behaviour, the UK and its allies are getting on with the hard work of finding a vaccine and protecting global health.''
TASS cited Kremlin spokesman Dmitry Peskov as saying Russia had nothing to do with any alleged hacker attacks on pharmaceutical companies and research institutes in Britain.
RIA cited Peskov as saying the Kremlin rejected London's allegations, which he said were not backed by proper evidence.
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