U.S. believes Canada-India row over Sikh activist's killing could upend strategy for countering China

The Biden administration is anxiously observing a dispute between Canada and India, with some officials fearing it could derail the U.S. strategy toward the Indo-Pacific, which aims to counter China's influence in the region and elsewhere.

Publicly, the administration has maintained that Canadian Prime Minister Justin Trudeau's allegations that the Indian government may have been involved in the murder of a Sikh separatist ne....