Newsweek has broken down how Moscow, Beijing, London, New York, Los Angeles, Tokyo and Paris would be affected if any of these cities were targeted by a W88 exploding in an airburst, according to NUKEMAP, a resource created by by Alex Wellerstein, a professor and historian of nuclear technology.

GOP House Speaker Mike Johnson tells Dana Bash on “Inside Politics” that he supports President Trump’s calls to resume testing nuclear weapons because “the only way to maintain peace is to show strength.

Russia said it tested a nuclear-powered cruise missile and torpedo, two of its experimental weapons, in recent days.

"We do not see anything that would give rise to the hypothesis of any substantive work going on there," Rafael Grossi says.