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DW.com looks at what it means for first Finland, and then Sweden joining NATO.

For Finland the invasion of Ukraine where people speak Russian and have close cultural ties comes as a reminder of past history. Under the treaties that ended the war with Napoleon in 1815 after the Congress of Vienna, Finland was given to Russia and Norway wrested from Denmark was given to Sweden. Jens Stoltenberg now head of NATO is a former prime minister of Norway. Russia invaded Finland in 1940, and Germany invaded Norway during that war. As a result there are historical reasons why 62% of Finns support joining NATO. 

What this means for NATO- This means NATO's border with Russia will double from 1300 to 2600 kilometres. Finland would be different alone compared to being part of the NATO alliance. For NATO this means 280,000 Finns in its army if mobilized under Finland's compulsory military service would be added to defending the border. Finland already is training with US equipment and training since 2015 and is in a joint defense plan with NATO.

Sweden's situation is quite different. It has benefitted from neutrality and never been occupied by any power in the 500 years of European wars for balance of power in the region. In the last 200 years Sweden has acted as a neutral state and stayed out of 2 world wars and other conflicts. For Sweden to join NATO it has to change this historical neutrality and has to be convinced that the invasion of Ukraine and the immense destruction in Ukraine with over 4 million refugees mostly women and children is an event that has changed everything.

If Sweden were to join NATO not much could be expected for ground forces as Sweden has a small army. Sweden also has no land border with Russia. Sweden is on the Baltic Sea which is also a border for Russia. Sweden does bring 100 modern fighter aircraft and 8 modern submarines that would secure the Baltic Sea. 

If one or both countries were to join NATO this would happen by June and both countries would join NATO immediately after 30 NATO member countries approve this.