- More than 1,500 Russian tanks have been lost since it invaded Ukraine, a monitoring group found.
- That's over half of the operational tanks Russia likely started its invasion with, the group said.
- Western allies are now sending Ukraine modern, advanced tanks, creating a new challenge for Russia.
Russia has lost more than 1,500 tanks, around half of its operational fleet, in Ukraine, according to a Dutch monitoring group that has been tracking Russian equipment losses.