5696a721_NappyFAQ__Clarifications___Comments
[Nation/CP Value/ +] Russia [6] + [Event Name] Holy Mother Russia [Clarifications & Comments] 
When this event is played to draw two new cards, one of them must be played immediately. However, because the event is also a "+" card, the Russian also has the option of playing yet a third card. Russian Winter cannot be voided by Persian War. While Subject Neutral or in the same Camp with her former conqueror, Russia can ignore Ceded Duchies controlled by that conqueror with respect to using the Holy Mother Russia event.
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