Explanation:

The International Court of Justice (ICJ) in The Hague ruled that the United Kingdom must transfer the Chagos Islands (Diego Garcia)to Mauritius as they were not legally separated from the latter in 1965. It has ruled that continued British occupation of the remote IndianOcean archipelago is illegal. In a non-binding opinion issued on 25th Feb 2019, the ICJ ruling deals a humiliating blow to the legitimacy of Britain’sterritorial claim over the Chagos islands, which they call the British Indian Ocean Territory (BIOT).