A senior Western intelligence official briefed by multiple intelligence agencies estimated Tuesday 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 said that 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 said 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 spoke on condition of anonymity to discuss the intelligence assessment.

Britain is vowing to end London’s status as a haven for oligarchs and their ill-gotten gains with a law intended to prevent the real owners of businesses and properties being hidden from view.

The government said the Economic Crime Bill will force anonymous foreign owners of U.K. property to reveal their real identities ”to ensure criminals cannot hide behind secretive chains of shell companies.” Those who don’t comply face being unable to sell their property or a five-year prison sentence.

Prime Minister Boris Johnson said the measure, which has to be approved by Parliament, would help “tear back the facade that those supporting (Russian President Vladimir) Putin’s campaign of destruction have been hiding behind for so long.”

Successive British governments have promised for years to end London’s status as a safe haven for dirty money, with little effect.

The anti-corruption group Transparency International says Russians linked to the Kremlin or accused of corruption own 1.5 billion pounds’ ($2 billion) worth of London property, and 90,000 properties in Britain are owned by shell companies.

(AP)