Unspun World: Who can challenge Trump?

The BBC's world affairs editor, John Simpson, asks defence correspondent Jonny Beale where the war in Ukraine is heading and what victory might look like; finds out from North America correspondent Anthony Zurcher if any of the Republican presidential candidates will give Donald Trump a run for his money; analyses a new era in relations in the Middle East with Baran Abbasi from BBC Persian; and explores why South Africa is in so much trouble, and what can be done about it, with South Africa correspondent Nomsa Maseko.Produced by Pandita Lorenz and Benedick Watt.