During a hearing on Wednesday, judges upheld the war crimes conviction for Slobodan Praljak, an ex-commander of Bosnian Croat forces. Upon hearing the verdict, Praljak said he was not a criminal and then drank from a bottle containing poison. Here is what you should know about war crimes.

The U.S. Defense Department contains an inventory of roughly 7,100 nuclear warheads. About 4,760 are active, while approximately 2,340 warheads are retired, but still intact. The retired warheads are in storage and await dismantlement. Here is what you should know about nuclear weapons:

North Korea’s nuclear-weapons tests, missile launches, and threats to attack American territory are hostile acts. What is debatable is how the United States and allies should respond.

Determining when and where to serve “the interest of humanity” is not a science. In a broken world, American policymakers must seek the counsel of the heart and the head, aim for the achievable, and choose the least-bad option.

It’s been widely noted that the U.S. missile strikes on a Syrian airbase seem at odds with Donald Trump’s electioneering opposition to American intervention. But there should be little surprise.

With the Middle East on fire, Europe on edge, Russia on the march, and China on the rise, America’s interlocking system of alliances is more important now than at any time since the beginning of the Cold War.