Stephen Sackur speaks to Bill Browder, the American investor who made a fortune in post-Soviet Russia before falling foul of Vladimir Putin. Browder has long campaigned for Russia’s economic isolation - his lobbying has been instrumental in the US passing the Magnitsky Act in 2012, which imposed targeted sanctions on Russian individuals directly connected to rights abuses. Thanks to the invasion of Ukraine, Russia is now facing further Western sanctions. But Putin’s war machine hasn't yet ground to a halt and he shows no sign of reversing course. Has Russia’s economic resilience been underestimated?