New Delhi, Jan. 9 -- The United States has decided to withdraw from 66 international organisations, marking one of the most significant reductions in multilateral engagement in recent decades.

The decision was formalised through a presidential memorandum issued on January 7 by President Donald Trump and includes exits from major climate-related bodies such as the India-headquartered International Solar Alliance (ISA) and the United Nations Framework Convention on Climate Change (UNFCCC).

While the US exit from the ISA-an initiative led by India and France to expand global solar capacity-is not expected to affect its core objectives, the move has drawn attention as the administration had not earlier indicated plans to withdraw from the g...