London (CNN) -- Argentinian President Cristina Fernandez de Kirchner has again opened the dispute over sovereignty of the Falkland Islands in the South Atlantic, accusing the British government of blatant colonialism. Known to the Argentinians as Las Malvinas, the two countries went to war over the territory in 1982 after the then military government in Argentina landed troops on the islands. In an open letter to British Prime Minister David Cameron and published in British newspapers Thursday, the Argentinian leader said "Britain, the colonial power, has refused to return the territories to the Argentine Republic, thus preventing it from restoring...