By "foreign national" I meant someone who the KGB viewed as a legitimate foreign opponent, say an enemy agent, political leader, or a counter espionage officer. They would have everything to gain by making a murder look like an accident, or by making it look as if it was done by some third party. An example of this would be the Pope. When one of their own people turns, as did Litvinenko, it is carried out in such a way as to let his former colleagues know exactly who was behind it, and it is always very brutal. Where L. got his passport is irrelevant, to the KGB he was still KGB. Contrast his murder to the journalists recently murdered in Moscow for anti-Putin activities. On the surface, they look like simple criminal acts: the lady was a Russian and the gentleman an American, but neither had any KGB ties.