Condoleezza Rice, who served as US secretary of state between 2005 and 2009, said she was "honoured to know and to be inspired" by Margaret Thatcher.
I am deeply saddened by the news of the passing of Baroness Thatcher.
There was no more potent force in the defense of freedom than this remarkable woman.
Her unshakable belief in the universal appeal of liberty helped to steer the free world through treacherous times until communism was defeated and Europe emerged whole, free and a peace.
I was honored to know her and to be inspired by her. Baroness Thatcher will be missed but generations will draw strength from the memory of her passion for freedom.
More top news
Five men have been arrested on suspicion of terrorism offences in the West Midlands.caution
Consumers have been warned to immediately stop using Indesit tumble dryers after a machine reportedly caused a huge fire in a tower block.
Some 29 children have been killed in Aleppo in the week leading up to US-Russia talks which aid workers hope will lead to a vital ceasefire.