Boris Johnson has announced sanctions against some of Vladimir Putin's closest allies.

The include Gennady Timchenko, Boris Rotenberg and his nephew Igor Rotenberg - described by the prime minister as "three very high net worth individuals".

But many experts are questioning how effective the sanctions will be - and what cost UK firms will have to pay.

Read more here: https://news.sky.com/story/ukraine-crisis-who-are-the-three-russian-oligarchs-dubbed-putins-cronies-hit-by-uk-sanctions-12548762

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