As Vladimir Putin cautiously supports the idea of a ceasefire but raises questions about Donald Trump's proposals, has he been forced into a zugzwang—a chess position where any move worsens the outcome? Dr Stephen Hall from the University of Bath explores the challenges and complexities ahead.

The World in 10 is the Times' daily podcast dedicated to global security. Expert analysis of war, diplomatic relations and cyber security from The Times' foreign correspondents and military specialists. 

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