The US has announced it will send controversial weapons to Ukraine as part of more than $1bn (£800m) in military and humanitarian aid.
Russia condemned the move to equip US Abrams tanks with shells strong enough to pierce conventional tank armour.
They are made of depleted uranium – a by-product of uranium enrichment stripped of most radioactive material.
Overnight, suspected Ukrainian drone attacks were reported on the Russian city of Rostov-on-Don and near Moscow.
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