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.

The war has not been going the Kremlin’s way recently, with battleground losses and mounting casualties. With renewed strikes, Moscow hopes to gain a better position for negotiations.

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.