The US has announced it will supply depleted uranium tank shells to Ukraine as part of more than $1bn (£800m) in military and humanitarian aid.
Russia condemned the move to equip US Abrams tanks with the controversial armour-piercing munitions.
The announcement came as Ukraine accused Russia of killing 17 people in a missile attack on a market street.
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.