Sweden abolished compulsory military service for men in 2010 because there were enough volunteers to meet its military needs.
It has never had a military draft for women. The government said "the all-volunteer recruitment hasn't provided the Armed Forces with enough trained personnel. The re-activating of conscription is needed for military readiness."
In September, non-NATO-member Sweden stationed permanent troops on the Baltic Sea island of Gotland. Defense Minister Peter Hultqvist described the move as sending a signal after Russia's 2014 annexation of Crimea and its "increasing pressure" on the neighboring Baltic states of Estonia, Latvia and Lithuania.
About 20,000 people now work for the Swedish armed forces, 84 per cent of them men and 16 percent women, according to the forces' website.
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But the armed forces lack 1,000 active troops as well as 7,000 reservists, according to Sweden's coalition government of Social Democrats and Greens.
Under the plan approved today, at least 4,000 18-year-olds could be called up each year. Enrolment should be made possible from July 1, and basic military training with compulsory service from January 1. Swedes will still be able to volunteer for military service.
Hultqvist said he had been inspired by neighboring Norway, which in 2013 introduced a law applying military conscription to both sexes.
That made Norway the first NATO member to draft both men and women, joining a tiny group of countries around the world, including Israel.
Conscription was introduced in Sweden in 1901, but had gradually winded down and was formally canceled 109 years later.