Sweden and Finland are expected to hand in their applications to join NATO, despite Turkey threatening to veto the move.
The Swedish and Finnish Prime Ministers say they are confident a deal can be done, and insist it is the best way to protect themselves in the light of Russia's invasion of Ukraine.
That has forced a reappraisal of both country's defence, including places like Gotland in the Baltic Sea.
Sky's Europe Correspondent Siobhan Robbins reports.
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