The biggest and most controversial issue for the 31 member nations at the Nato summit in Lithuania tomorrow will be whether to offer fast-track membership to Ukraine. Would this be a step too far – or has the invasion by Russia made it inevitable? We speak to a former Nato secretary-general.

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Guest: Lord George Robertson, Nato secretary-general, 1999-2004.

Host: Manveen Rana.

Clips: NATO History, Woodrow Wilson Centre, AP Archive, Voice of America, PA Media, BBC News, Sky News, Channel 4 News, Reuters.

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Could Ukraine really join Nato? A former secretary-general answers