The leaders of China, Russia, India, Iran and other nations in the BRICS club gather in New Delhi this weekend, but wars and soaring energy prices divide them.

The demonstration of a potent cyberweapon has exposed China’s vulnerabilities and added to the urgency of A.I. safety talks between Beijing and Washington.

China sees the BRICS group as a vehicle for challenging American power. India wants to keep the group broad enough to avoid choosing sides.