"An emergency surgery was performed [on the diplomat] at night. It went well, but the doctors say that his condition remains grave and he is still in the intensive care unit", Glaz told reporters.
Meanwhile, Turkey's Foreign Ministry said earlier on Thursday that Poganshev was in satisfactory condition and may soon be transferred from intensive care to a general ward.
According to preliminary information, the attack was not politically motivated and stemmed from a personal conflict between the diplomat and the shooter.
On Wednesday, Aleksandr Poganshev, a counsellor who deals with administrative issues at the Belarusian Embassy in Ankara, was shot about five times by a man whom the embassy later said was a mentally unstable Turkish ex-soldier. The diplomat was hospitalised in grave condition after the attack.