President Biden said he is willing to order sanctions directly on Vladimir Putin if Russia enters the Ukraine. CNN teams are witnessing more military arrive in Ukraine as the White House characterizes an invasion as "imminent." 

While we have boosters and vaccines, some companies are working on a fourth shot aimed just at the Omicron variant. Pfizer and BioNTech have begun a clinical trial for their Omicron-specific Covid-19 vaccine candidate.

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