The Biden administration is announcing it will ship cluster munitions to Ukraine as part of a Pentagon military aid package. The weapons are banned under the Convention on Cluster Munitions, an international treaty signed by more than 100 states — though not by Russia, Ukraine or the United States. Investigators with Human Rights Watch have documented how cluster bombs used by Russia and Ukraine have repeatedly killed and injured civilians. The group warns unexploded bomblets left behind after cluster attacks will continue to pose a risk to civilians for years to come.