What can the White House do to free Evan Gershkovich?

At the end of March, Russian authorities arrested Evan Gershkovich, a reporter for the Wall Street Journal, on espionage charges. He is still in a Moscow prison more than a month later, and at the weekend President Biden promised he was ‘working like hell’ to bring Gershkovich, and others detained in Russia, home. This week Jonathan Freedland speaks to Polina Ivanova, a reporter for the Financial Times and friend of Gershkovich’s, who breaks down the politics behind his detention