As we noted previously, six Russian diplomats have died in the last 3 months - all but one died on foreign soil. Some were shot, while other causes of death are unknown. Note that a few deaths have been labeled "heart attacks" or "brief illnesses."

1. You probably remember Russia's Ambassador to Turkey, Andrei Karlov — he was assassinated by a police officer at a photo exhibit in Ankara on December 19.

2. On the same day, another diplomat, Peter Polshikov, was shot dead in his Moscow apartment. The gun was found under the bathroom sink but the circumstances of the death were under investigation. Polshikov served as a senior figure in the Latin American department of the Foreign Ministry.

3. Russia's Ambassador to the United Nations, Vitaly Churkin, died in New York this past week. Churkin was rushed to the hospital from his office at Russia's UN mission. Initial reports said he suffered a heart attack, and the medical examiner is investigating the death, according to CBS.