Conversation so far:
Did Alexander Litvinenko support terrorism?
No
What does FSB stand for?
Federal Security Service of the Russian Federation
What was Alexander Litvinenko's position in the KGB?
In 1988, Alexander Litvinenko was officially transferred to the Third Chief Directorate of the KGB, Military Counter Intelligence.

Question: What terrorist attacks was he involved in?
Self-contained rewrite: What terrorist attacks was Alexander Litvinenko involved in?