"The exercise takes place in the air, on the ground and at sea in large parts of the country," the Swedish Armed Forces said, announcing the exercise which is scheduled to run until May 11.
The Nordic nation has had close ties with NATO ever since joining the Partnership for Peace programme in the 1990s, but as a non-member, it is not covered by the security guarantees of NATO's Article 5 on collective defence.
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While surrounded by alliance members, as the only Nordic country outside NATO, experts say Sweden could become a strategic interest for Russia in the event of a conflict.