A surviving Kalmar Union and the North Sea balance

How would a Kalmar Union that survived the Stockholm massacre affect the balance of power in the North Sea?

Its survival would first require overcoming Swedish resistance to Danish rule. A lasting Scandinavian bloc would become another northern power for Britain to consider, while extensive land borders limited its freedom to concentrate at sea.

The proposed replacement of Swedish nobles with Danish loyalists immediately raises doubts about whether the union could survive. If it did, it would combine Denmark, Norway, much of Sweden and Finland, Iceland and parts of Greenland, with control of some interior regions still incomplete. Islands near Scotland create a possible source of friction with the Scots, then the English and later Britain. Further expansion into Schleswig-Holstein or parts of Poland is a possibility within the scenario. Britain would have another northern power to consider as it developed. The union would also face continental pressures from Russia and the German states, so a large territory would bring defensive obligations as well as resources.