Russia's ambassador to Sudan was found dead Wednesday in Khartoum. That's the seventh Russian diplomat to have died since November last year, in addition to an aide to a former deputy prime minister, a lawyer for a Putin-foe, and a former Russian MP. All but two 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." Here's what you need to know:
