LONDON – As tensions with President Donald Trump , the Danish military developed detailed plans to blow up airfields in Greenland in the event of a US invasion, two Europeans officials said on March 20 .

Danish soldiers were sent to Greenland equipped with explosives and blood supplies, underscoring the seriousness of the contingency plans, according to the officials, who had knowledge of the plans but said they could not be identified because of the sensitivity of the subject.