Denmark’s prime minister insists Greenland is not for sale and is calling for a robust show of support from her European Union partners should U.S.

Danish Prime Minister Mette Frederiksen said she now understood the need for the island nation to secure its borders as competition for the thawing Arctic regions heats up.

Greenland plans to ban foreign and anonymous donations to its political parties after the Trump administration has said the US president is serious about taking control of the vast Arctic island. The government of Greenland on Monday put forward an emergency parliamentary proposal to safeguard the country’s “political integrity” ahead of elections due by April 6.