Since the Danish military had put up almost no resistance to the invasion, the German occupiers allowed the government to put up some semblance of remaining independent under a "peaceful occupation".[70] It also helped that the Germans considered the Danes "fellow Aryans" and valued good public relations over their usual brutal methods. Hitler even sent King Christian X a long, flower telegram in 1942 for the king's birthday; Hitler was furious when the king slighted him by sending a curt "thanks" in return.[71]
https://rationalwiki.org/wiki/Denmark#Nazi_occupation_and_Danish_heroism