Denmark decided to turn down an offer last year from Chinese mining company General Nice Group to buy an abandoned naval base on Greenland due to security concerns, sources involved in the decision said.

Danish politicians did not want to jeopardize their country's relationship with the United States, Copenhagen's main ally, by granting another power a potential military foothold in Greenland, the sources told Reuters.

In a statement to Reuters, the Danish defense ministry said the base at Gronnedal — which had been put up for sale — would be reopened as a strategic and logistical location for storing fuel and materiel and for training personnel. It did not comment on the Chinese offer.