The Spaniard, who is accused of having sent six envelopes with combustible pyrotechnic material at the end of November 2022, appears to be a pro-Russian USSR nostalgic, according to initial findings.
References to relations with the Russian secret service, which had previously been reported, have not yet been substantiated.
Hans Christian Roessler
Political correspondent for the Iberian Peninsula and the Maghreb based in Madrid.
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A 74-year-old retired civil servant was arrested on Wednesday in Miranda de Ebro in the province of Burgos on suspicion of terrorism.
An employee of the Ukrainian embassy was slightly injured when opening one of the letters.
They contained no explosives, but a home-made device that was supposed to cause a deflagration with a jet of flame.
The other shipments were addressed to the Spanish Prime Minister's office, the Ministry of Defense, an air force base, a defense contractor and the American Embassy.
During a search of his apartment, the police found a drone along with other material for the construction of incendiary devices and pro-Soviet propaganda.