'Tough response', 'Colossal mistake': Biden, Putin warn each other on phone call

President Joe Biden on Thursday warned his Russian counterpart Vladimir Putin of a tough US response to any invasion of Ukraine, while the Kremlin leader said anti-Moscow sanctions would be a "colossal mistake." After a 50 minute phone call -- their second in just over three weeks -- both presidents indicated support for further diplomacy on the tense standoff between Russia and Western-backed Ukraine. Watch this video for more.