Across Europe, governments and intelligence agencies have accused Russia of escalating a campaign of hybrid warfare, from sabotage and GPS interference to cyber operations and suspected attacks on critical infrastructure.
Much of the attention is focused on Kaliningrad - Russia's heavily militarised exclave on the Baltic Sea - and the nearby Suwałki Gap, NATO's only land link to the Baltic states.
Bianca Nobilo explores how a medieval Prussian city became one of Europe's most strategically important military flashpoints. Tracing the history of Königsberg, the Second World War, the Soviet Union and NATO's expansion, she takes a look at why Kaliningrad remains central to Russia's military strategy and how the Suwałki Gap is considered one of the alliance's greatest vulnerabilities.
Could this war continue to shape Europe's security and what does that mean for the future?
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