The head of MI5 also revealed the UK has rejected at least 100 Russian diplomatic visa applications since the Novichok attack in Salisbury in 2018.
Mr McCallum signalled Moscow's fixation on London reflected"the importance of the UK's support to Ukraine's self-defence".
In 2018, the government expelled 23 suspected Russian spies, in the UK on diplomatic visas, as part of its response toand his daughter in Salisbury with a nerve agent.
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