“We are at the beginning of a hybrid war against Europe,” Frederiksen said in a social media post, warning that such incidents could become more frequent. “I think we will see more of these incidents... We are seeing a pattern, and it does not look good,” the prime minister said.She said Copenhagen had not yet identified those responsible for attacks “on our airports and other critical infrastructure,” but noted that “We can at least say that there is one country that poses a threat to European security above all others, and that is Russia.”Her comments came after Aalborg Airport was temporarily closed overnight on Friday following reports of suspicious objects, forcing the cancellation of at least two flights. Similar drone activity disrupted airports in Denmark and Norway earlier in the week.