Cluster munitions are artillery rounds that when fired, break apart before impact and scatter small bombs. They are widely condemned and even banned by many nations for the risk they pose to civilians and because years later, unexploded bombs can be unearthed or stumbled upon and explode. Still, Ukraine and the Biden administration argue that the cluster munitions will be a critical weapon in Ukraine's counteroffensive. The World's Marco Werman talks to Mark Cancian, a retired Marine colonel and currently a senior adviser at the Center for Strategic and International Studies, about the risks and reasoning behind the decision to share these notorious weapons with Ukraine.