Iran has promised “severe revenge” against the United States for the killing of Maj. Gen. Qassim Suleimani. But what made the high-ranking military leader an American target in the first place? Guest: Helene Cooper, who covers the Pentagon for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading:Maj. Gen. Qassim Suleimani was known as the instigator behind proxy wars that fueled instability in the Middle East. His death further disturbed the region’s delicate power balances — and effectively ended a landmark nuclear deal.Some Iranian officials called the American strike on General Suleimani an act of war. As the consequences of the killing ripple outward, our columnist asks: Was the strike a good idea?Catching up after a weekend offline? Here’s what else you need to know about the death of General Suleimani.