Pyotr Levashov was held in Barcelona on Friday and is remanded in care.
Spanish police said Mr Levashov controlled a botnet called Kelihos, hacking data and exhibiting harmful programming in countless.
The catch was somewhat of a “mind boggling request did as a gathering with the FBI”, police said.
Mr Levashov is liable to a US comprehensive catch warrant and a Spanish court will hear whether he can be ousted.
A lot of his stated action included ransom ware – debilitating a PC’s path to particular data and requesting an outcome for its discharge.
Mr Levashov’s better half Maria revealed to Russian telecaster RT that the catch had been made regarding charges that Russians had hacked the US presidential race.
She said Spanish police had revealed to her the catch was as for “a sickness which seems to have been improved by my half and is related with [Donald] Trump’s triumph”.
Regardless, Agence France-Presse news affiliation refered to a source near the matter in Washington as saying that Mr Levashov’s imprisonment may have been “not attached to anything including explanations of Russian impedance with the US race”.
Russian hacking of the US race
A US information report discharged in January charged that Vladimir Putin had attempted to help Mr Trump to triumph, states unequivocally denied the Russian president.
Mr Trump later remarked that the outcome of the race had not been influenced.
A couple cybersecurity specialists, including Brian Krebs, have likewise related Mr Levashov to a Russian spam boss, who utilizes the false name Peter Severa.