London must impose 'intense banking sanctions' on Russia
24 March 2014 Last updated at 10:42 GMT
London must impose "intense banking sanctions" on Russia's banks and oligarchs, writer Ben Judah has said.
Mr Judah described London as "the capital of Russian finance" and explained that, as a result, Britain has "more power" than Germany or the US to curb President Putin's actions.
First broadcast on BBC Radio 4's Today programme on Monday 24 March.