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Happening now, a new U.S. assessment that a Russian air defense system may have downed a passenger plane in neighboring

Kazakhstan.

Stand by for an update on the deadly crash, as questions swirled about what went wrong and who's to blame.

Also this hour, President-elect Trump leaves a trail of very provocative Christmas Day posts,

threatening and insulting U.S. allies.

He's tripling down on talk that the U.S. could somehow seize control of Canada,

Greenland, and the Panama Canal.

Plus, we're tracking the rise in cases of bird flu among animals in the western U.S.,

fueling fears it could spread to people and potentially, potentially lead to another pandemic.

Welcome to our viewers here in the United States and around the world.

I'm Wolf Blitzer. You're in the Situation Room.

Our top story this hour, new indications that Russia may be responsible for a passenger

plane crash that killed at least 38 people on board.

...