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Why Poland planned a Kaliningrad border barrier

Summary
A look back at the defence announcements in Poland and Norway that framed security concerns on Europe's northern and eastern edges.
What prompted Poland to announce a barrier on its border with Russia? On 2 November 2022, Poland's Minister of National Defence, Mariusz Błaszczak, announced the construction of a barrier along the frontier with the Russian exclave of Kaliningrad.
The stated reasoning was specific. Poland believed that Russia would use the border to transport African and Asian immigrants illegally into Europe. The announcement thus framed the border as a route for irregular migration, with the barrier as the response.
The move came amid a wider run of security steps in the region. On 31 October 2022, Norwegian Prime Minister Jonas Gahr Støre said the country's military alert level would rise the following day, 1 November. He cited sightings of military drones near offshore oil rigs over the previous few weeks.
The two announcements involved different threats, one concerning migration and the other drones near energy installations. Both were reported within the context of the Russo-Ukrainian War, and both showed governments on Russia's periphery adjusting their defences and border policies.