In a wide-ranging conversation, National Security Adviser Jake Sullivan talks about how Putin’s invasion has gone wrong, a fraught meeting with the Saudi crown prince, and the upcoming anniversary of the Afghanistan withdrawal.

Russia’s war on Ukraine has given us just a peek of the world to come.

The U.S. president has promised Ukraine “whatever it takes, as long as it takes.” But out of anxiety about escalation, Washington is making decisions that could prolong the war.

After Russia’s invasion, many post-Soviet immigrants in the U.S. are estranged from or barely speaking with longtime friends back home.

Wars are won by deeds—but also by persuasive moral arguments.

Will enough of Trump’s party finally be willing to stick up for Ukraine rather than follow his lead and bow to Russia?

The Kremlin is accusing a Russian mercenary of an attempted coup—a stunning development that could change the course of the war in Ukraine.

My generation has tasted freedom and experienced a competitive, vibrant political life. We can’t be made a part of what Russia has become.

Yevgeny Prigozhin has picked a public fight with the Russian military leadership in Ukraine. Why does the Kremlin tolerate him?

Leaders shouldn’t give in to Putin’s nuclear rhetoric.