Fahem al Tai, 53, had been taking part in weeks of rallies denouncing Iraq's entrenched political elite as corrupt, inept and beholden to neighbouring Iran.
New Russian ambassador to Turkey, Alexei Yerkhov, emphasized the momentum gained between Ankara and Moscow and described bilateral ties as "promising."
The late politician's allies said the investigation had been a cover-up and that the people who had ordered his killing remained at large.
Philippe Moreau Defarges says killing Turkey's president in the context of a civil war would be a legitimate way to remove him from power.
Malaysian police said the man detained on Thursday is the boyfriend of the second female suspect arrested earlier in the day.
The assassin who shot dead Russia's ambassador to Turkey was a 22-year-old member of the Ankara police force. Turkish authorities are investigating suspected links to FETO.
Republican presidential nominee Donald J. Trump faces criticism for his latest remarks, seemingly suggesting that assassination would be the only way to stop his Democratic presidential rival Hillary Clinton.
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