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On June 28, 1914 Archduke Ferdinand was assassinated in Saraevo (BTW, does this count as a proper regicide?). At the same day Nicholas II had been assassinated <chose the place and disregard a relatively low probability of the event; he can also die from an indigestion >.
Russia is in some kind of a dynastic crisis (taking into an account Alexei's age and health and the issue of regency) and interference on the Serbian behalf is low on the list of priorities.