Speaking in London on Monday, Minister of State for Defence Annabel Goldie said some of the ammunition for the Challenger 2 battle tanks that Britain is sending to Ukraine includes armour piercing rounds which contain depleted uranium.

“If all this happens, Russian will have to respond accordingly, given that the West collectively is already beginning to use weapons with a nuclear component,” Putin said in remarks after a summit with Chinese President Xi Jinping. He did not elaborate.

https://www.usnews.com/news/world/articles/2023-03-21/russia-blasts-uk-move-to-send-ammo-with-depleted-uranium-to-ukraine