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Court documents allege that suspect Dylan Earl was connected to the proscribed terrorist group the Wagner Group, the domestic Press Association news agency reported.
Christopher Cash, 29, and Christopher Berry, 32, are accused of spying for China.
Details of the case - the first brought under new spy laws - can now be reported for the first time
Two men from Croydon have been charged with terrorism-related offences after new legislation came into effect last December.
A 20-year-old British man has been charged with masterminding an arson attack on Ukrainian-linked businesses in London after allegedly being recruited as a "Russian spy".