Nothing new here, the Swedish government has been publishing this guide since the second world war [1] and updates it regularly. It is not directly related to an increase in international tensions and would have been published even if Putin and his cronies were out on the pony farm. The last update was published in 2017/2018 by the previous labour-led government, now that Sweden is part of NATO it needed an update to reflect that fact. Previous versions were published in 1943, 1952, 1961, 1978, 1983, 1987, 1989, 1991 and 2017/2018.
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