Former US President Donald Trump has publicly condemned the United Kingdom's decision to transfer sovereignty of the Chagos Archipelago, including the strategically vital island of Diego Garcia, to Mauritius. In a series of posts on Truth Social, Trump described the move as an "act of great stupidity" and a display of "total weakness" that he believes rivals like China and Russia will recognize. He linked this decision to his own past ambitions to acquire Greenland from Denmark, suggesting it highlights national security concerns. Trump's criticism comes despite the fact that the agreement between the UK and Mauritius, finalized in May 2025 and currently undergoing ratification, ensures continued UK and US military access to the Diego Garcia base for at least 99 years, with further extension options. India, which has significant security interests in the Indian Ocean, has officially backed the UK-Mauritius deal, viewing it as a completion of Mauritius's decolonization. The United States, under the Biden administration, had also welcomed the agreement, recognizing its role in securing the long-term operational stability of the base. The UK government has defended the deal, stating it resolves a long-standing sovereignty dispute and was necessitated by international legal rulings that threatened the base's future. The agreement involves significant financial considerations, with the UK set to pay Mauritius substantial annual fees for the lease of Diego Garcia. Despite Trump's strong opposition, the treaty is proceeding, underscoring the complex geopolitical considerations surrounding the base.