Will there be a nuclear arms race between the U.S. and Russia?

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06:44

The U.S. has announced its intention to pull out of a key nuclear weapons treaty -- and now there are concerns a pull-out could lead to a new arms race. With more on what all of this means and whether we are headed to Cold War part two, CBC's Suhana Meharchand nuclear weapons policy expert Joe Cirincione.

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