If President Trump flies to China as planned in May, the primary topic will clearly be the rippling economic effects of a war that Beijing has made clear it viewed as unnecessary.

President Trump withdrew from the Obama-era nuclear accord in 2018, saying it was the worst deal ever. But Iran responded with an enrichment spree that haunts the negotiations to this day.

The warning did not name specific facilities that had been struck or say whether any damage had been done.

The 2,000 paratroopers heading to the region may give President Trump more leverage in negotiations, but they also leave him with the option of doubling down on military force.

Our national security correspondent David E. Sanger looks at President Trump’s trouble handling retaliatory attacks by Iran that have largely choked off the Strait of Hormuz.

In the first days of the U.S.-Israeli campaign against Iran, Mr. Trump pressed for a popular uprising against Tehran’s government.

As the conflict with Iran expands and intensifies, President Trump’s options — to fight on, or to move toward declaring victory and pulling back — both carry deeply problematic consequences.