President Putin decries "betrayal" and "treason" after a dramatic challenge by the chief of the Wagner mercenary force, Yevgeny Prigozhin.

Russia editor Steve Rosenberg, security correspondent Frank Gardner and broadcaster Gabriel Gatehouse try to make sense of a moving and murky situation in Russia.

Today’s extra episode is presented by Victoria Derbyshire and Vitaliy Shevchenko. The series producer is Tim Walklate. The senior news editor is Sam Bonham.