Argentina plans to raise Britain’s “militarization” of the Falkland Islands at the UN, the BBC reports. The islands, long a sore spot between two countries, have been the site of increasing tension in recent months. Britain recently sent their newest naval destroyer to the region (along with Prince William, a helicopter rescue pilot assigned to the ship). Argentina, meanwhile—along with other South American nations—closed its ports to ships from the islands in December. Argentine President Cristina Fernandez De Kirchner will launch a formal complaint over Britain’s actions at both the UN Security Council and General Assembly.