More than 5,000 Russian soldiers captured or killed, claims Western official

A senior Western intelligence official briefed by multiple intelligence agencies estimates that more than 5,000 Russian soldiers have been captured or killed so far, and that Ukrainian forces have eliminated significant numbers of Russian aircraft and tanks and some air defense systems.

The official says Russian forces have increased use of artillery north of Kyiv and around the eastern city of Kharkiv and northern city of Chernihiv, and have been using heavier weapons over the last 48 hours.

The official also says that Russian forces are bogging down in the Donbas region in the east, where most Ukrainian forces are concentrated after eight years fighting Russian-backed separatists there. The official speaks on condition of anonymity to discuss the intelligence assessment.