Paul Charles Wilkins, 70, from Littleport in Cambridgeshire, was caught in an undercover Whatsapp sting.
Spanish courts are yet to decide whether to extradite Stanislav Lisov, 31, to the US.
Sources told McClatchy that intelligence and enforcement agencies had been investigating since last spring.
Santiago, an Iraq war veteran, had claimed that he was hearing voices and his mind was controlled by CIA.
The president-elect said FBI were 'very nice' to Clinton.
President-elect calls report held by FBI 'crap' at first press conference since winning election.
The duo allegedly hacked into emails of ministers, bankers and a former deputy chief of the secret service.
He attacked report for containing "no evidence" to tie him to documents stolen from Democrats.
President-elect has just confirmed Russia was behind political interference, see what he has said since his election.
There's 'no evidence' that Putin's plan to sway the election worked, Kellyanne Conway insists.
The director of National Intelligence said there was a difference between scepticism and disparagement.
David Puckett was found beneath frozen water in Denver, Colorado after vanishing on New Year's Eve.
Hacked DNC emails reached WikiLeaks via 'third party' says US intelligence.
Hacking and election tampering – state-on-state activity is never clear cut.
Don't believe the hype, Donald Trump needs to fix US cybersecurity.
GOP Senators vow to work with Democrats to strengthen Russia sanctions in next Congress.
'In revealing the facts, the government may also reveal how we got them.'
Warning comes after a publicly available list of US churches was posted on websites linked to Daesh.
During annual marathon press conference Russian President speculates 'maybe it was some guy sitting on a couch who did it.'
Cybersecurity firm that investigated DNC hack offers more evidence tying Russia to US election intrusions
Protesters reported crashing smartphones and disappearing Facebook updates.
The damaging emails from Podesta's personal account were steadily released by WikiLeaks until Election Day.