Possible Russian invasion of Ukraine could come as soon as January, U.S. intelligence warns

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Tensions between Russia and Ukraine could be reaching a boiling point as both sides have deployed troops to their shared border. Russian officials denied their deployment is for an invasion, saying it's for military exercies. Nina Krushcheva, an international affairs professor at the New School, explains to CBSN's Lana Zak about the tensions between the countries.