Perhaps an attack on Crimea from Ukraine? I don't think Russia would waste what's left of their sea based armament on another useless missile attack. Especially with those anti ship batteries now waiting in the shadows. The juice simply isn't worth the squeeze for a Christmas day message. It would be more likely that they would be used to shore up defenses on the peninsula and act to some degree as a shield for Russian forces/ emergency egress option.

Then again Russia has been gearing up for another run on kyiv. It would be allot sooner than expected