Negotiations between Ukraine and Russia have been underway this week. At the same time Mariupol and other Ukrainian cities have come under savage bombardment. If some sort of peace is to be brokered what compromises might be possible and what will be required to get there?

David Aaronovitch is joined by:

Oleksiy Semeniy, former advisor to the National Security and Defense Council of Ukraine

Aglaya Snetkov, author of “Russia's security policy under Putin” and a lecturer at the School of Slavonic and East European Studies in London.

Anatol Lieven, senior research fellow on Russia and Europe at the Quincy Institute for Responsible Statecraft and a visiting professor at King’s College, London.

Dr Julie Norman, lecturer in politics and international relations at University College London and co-director of its US politics centre.

Producers: Rosamund Jones, Kirsteen Knight and Ben Carter