The US told France and the UK to back off Egypt, for example. So why didn’t the US stop the UK and Argentina from going to war? Was that the end of the Monroe Doctrine?
While there's much more to be said on the subject, u/aquatermain discusses US reactions and involvement in the Falklands in In 1982, how did the United States react to their allies in the UK declaring war against the Argentinian military junta that they also tacitly supported?