Spanish authorities arrested an aristocrat with close ties to Pyongyang last week over U.S. charges that he advised North Korea on cryptocurrency technology.

But Alejandro Cao de Benos, the founder of the pro-North Korea sympathizer group Korea Friendship Association (KFA), insisted that Washington cannot force his extradition following his release a day later.

Spain’s National Police said in a press release on Friday that it had arrested “a fugitive wanted by the United States for a crime of fraud” following an Interpol tipoff, referring to Cao de Benos.

His arrest and detention at a Madrid police station came after a