1. Tensions between the U.S. and Iran are simmering.

The attacks in the Gulf of Oman this past week, in which two tankers were crippled, embolden the hard-liners in Washington and Tehran, each able to argue their longtime adversary is itching for war, our reporters explain. Our video journalists examine what the evidence shows.

Why have two disabled ships set the world on edge? Here are the basics.

Separately, the Trump administration is placing malware inside Russia’s power grid with a new aggressiveness. The move is both a warning and a push to be prepared to conduct cyberstrikes if conflict were to break out with Moscow.