Weapons Expert on Russia's 'Dirty Bomb' Claims Against Ukraine

Despite no recorded attacks involving what is known as a dirty bomb, the explosive remains a potential threat. Now, Russia is accusing Ukraine of preparing to use one. NHK World's Arisa Ishita spoke with one weapons expert to help explain what this bomb is and why Russia might want to see one used during its invasion.Despite no recorded attacks involving what is known as a dirty bomb, the explosive remains a potential threat. Now, Russia is accusing Ukraine of preparing to use one. NHK World's Arisa Ishita spoke with one weapons expert to help explain what this bomb is and why Russia might want to see one used during its invasion.