Russia has warned the UK not to provide depleted uranium shells as ammunition for the tanks it is sending to Ukraine, saying they contain a “nuclear component”.
Depleted uranium makes weapons more powerful, but it is feared those weapons could be a threat to people in areas where they are used.
Depleted uranium is naturally-occurring uranium, which has been stripped of much – but not all – of its radioactive matter.
It is a waste product from the process through which uranium is enriched for use in nuclear power plants and nuclear weapons.
Uranium is a very dense metal, so depleted uranium can be used to reinforce the armour-plating on tanks.