The high stakes talks which freed some of Putin's harshest critics. The biggest prisoner exchange between Russia and the West since the Cold War era took place last week, with 24 people released in total, including former US Marine Paul Whelan, and journalist Evan Gershkovich.

In this episode, Azadeh Moshiri speaks to the BBC's Eastern Europe correspondent Sarah Rainsford and our Security correspondent Gordon Corera.

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This episode was made by Richard Moran and Tse Yin Lee. The technical producer was Mike Regaard. The assistant editor is Sergi Forcada Freixas and the senior news editor is Richard Fenton-Smith.