Moscow’s repeated warnings of a major strike, combined with the delay before it happened, seemed intended to inflict a psychological toll on the Ukrainian capital.

President Trump is pressing Israel not to attack the Lebanese capital. An escalation in Israel’s campaign against Hezbollah could threaten peace talks with Iran.

A week after OpenAI made headlines with an A.I.-generated proof, a new “declaration” by 16 experts raises concerns that the technology threatens math as a discipline.