Russian President Vladimir Putin praises and warns U.S. at end-of-year press conference

Russian President Vladimir Putin held his year-end press conference, where he praised President Trump's decision to withdraw U.S. troops from Syria. He also warned of the growing threat of nuclear war between Russia and the United States. Markos Kounalakis, a foreign affairs columnist for McClatchy News and visiting fellow at the Hoover Institution, joins CBSN with analysis. VIEW HERE