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In response to Russia's invasion of Ukraine, the West retaliated with economic measures that have sent the Russian rouble tumbling.

Sanctions also cut major Russian banks from the global financial system and hurt state-owned firms and oligarchs, including Mr Putin himself.

So could Russian oligarchs topple Putin?

If not, what could?

Kirsty Wark is joined by former foreign secretary Lord Owen, political activist Bill Browder and author Catherine Belton.