Kyiv has intensified its counteroffensive against the Russian invasion, but has kept things murky on the size of the assault, the casualties and what forces it still has in reserve.
After holding back many of its units trained and armed by the West, Ukraine is now committing them, the officials said, but it remained unclear whether a full-scale assault was taking place.
Early in the counteroffensive, Ukraine lost as much as 20 percent of its weapons and armor. The rate dropped as the campaign slowed and commanders shifted tactics.