UK sanctions against some oligarchs may take weeks

They will take as long as its needed for said oligarchs to sell endangered properties.

If they were seizing real estate holding you'd see a massive drop in the prices for luxury London condos https://www.npr.org/2022/02/26/1083276850/us-sanctions-on-ru...

Easy explanation:

"The 6 Russian oligarchs who donated £2m to Tory party since Boris became PM"

https://www.express.co.uk/news/uk/1574370/Russian-oligarchs-...