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.
Unconfirmed video showed what appeared to be a blast in central Rostov where, according to Governor Vasily Golubev, one person was lightly injured and several cars were damaged.
Moscow Mayor Sergei Sobyanin said a drone that targeted the town of Ramenskoye had also been shot down and no damage reported.
The announcement of a new security package for Ukraine came during top US diplomat Antony Blinken’s visit to Kyiv, prompting an angry Russian response.
The 120mm uranium tank rounds included in $175m of US military equipment for Ukraine are for M1 Abrams tanks due to be delivered to Ukraine later this year.
Subscribe to our Telegram and YouTube Channels also join our Whatsapp Update Group
