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Vladimir Putin

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Fears grow over potential Russia invasion of Ukraine

U.S. officials believe Russia is laying the groundwork to invade Ukraine. The National Security Council says Russia has positioned a group of operatives to conduct a so-called "false-flag operation" in eastern Ukraine. Meanwhile, a cyberattack knocked out several government websites in Ukraine on Friday. CBS News correspondent Christina Ruffini has the latest, and UCLA political science professor Daniel Treisman talks to CBSN's Lana Zak about why these moves are significant.

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Biden and Putin hold phone call amid Ukraine tension

President Biden and Russian President Vladimir Putin spoke on the phone for nearly an hour amid growing concern over Moscow’s military buildup along the Ukrainian border. The two world leaders exchanged warnings, with President Biden telling Putin that the U.S. will act “decisively” if Russia invades Ukraine. CBS News political contributor and White House reporter for The Washington Post, Sean Sullivan, joins CBSN to discuss the high-stakes call.

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