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It won him the Nobel Peace Prize - alongside North Vietnam's Le Duc Tho - a decision bitterly attacked by peace campaigners.

In 1973, he was awarded a Nobel Peace Prize alongside North Vietnam's Le Duc Tho, who refused to accept.

Le Duc Tho refused the prize on the grounds peace had not yet been established.

Le Duc Tho refused the Peace Prize on the grounds peace had not yet been established.

This was the first of many secret meetings between Kissinger and Le Duc Tho, a high-ranking member of the North Vietnamese government.