Henry Kissinger, the former secretary of state under Richard Nixon, died at the age of 100 this week. One of the most famous and powerful diplomats of the 20th century, some will remember him as the person who won a Nobel peace prize for his work negotiating the end of the Vietnam war. For others, he will forever be known as a war criminal. So what is Kissinger’s legacy? This week, Jonathan Freedland speaks to journalist and author Michael Goldfarb about how Kissinger came to be one of the most powerful people of the 20th century, and why back in the 1970s he had the opportunity to criticise the man to his face – and chose not to. Does he regret staying quiet?