Aurora 17

[2] It was Sweden’s biggest military exercise in 23 years and involved troops from the United States and some other NATO countries.

The participating nations included France, Denmark, Estonia, Latvia, Lithuania, Norway, Germany, and the United States.

[2] The designated exercise area covered most of Sweden, but was focused on the Mälaren Valley, Stockholm, Gotland and Gothenburg.

[7] On 13 September 2017, Sweden′s defence minister Peter Hultqvist said, "The exercise sends an important signal about our security policy.

It raises the deterrent threshold against different types of incidents.”[8] He cited the “deterioration of the security situation in Europe” as the reason for the exercise.