President Donald Trump has pulled the United States out of 66 international organisations, triggering a major shift in global diplomacy. Among the exits is the India-led International Solar Alliance, a flagship platform aimed at expanding solar energy across developing nations. The White House says the move follows a sweeping review of treaties and institutions that allegedly no longer align with US national interests. Critics see a retreat from global responsibility, while supporters call it a sovereignty reset. For India, the US withdrawal tests whether global climate leadership can succeed without Washington. With America stepping back, India’s role in shaping clean energy cooperation and South-led alliances is now under the spotlight.