Russian agents are claimed to have gained access to secret information through the breach, which was reportedly discovered over the summer.
The Government has been urged to launch an urgent investigation following reports that Liz Truss’s phone was hacked.
Spies suspected of working for Russian president Vladimir Putin gained access to sensitive information, including discussions about the Ukraine war with foreign officials, the newspaper said, citing unnamed sources. Opposition parties are demanding a probe into the alleged attack, which will raise questions about the UK’s cyber security, as well as the judgment of Mr Johnson and Mr Case.
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