Germany’s intelligence chief has warned that Russia could test NATO’s resolve. Bruno Kahl thinks Vladimir Putin would do this by placing ‘little green men’ - in other words, plain-clothes soldiers - in Estonia like he did when he annexed Crimea in 2014. Emily Ferris, a Russia specialist from the RUSI think tank in London, examines how likely this is and looks at other ways the Kremlin might test NATO.

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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