The killing of Hardeep Singh Nijjar, a Sikh nationalist who had sought a separate state in India and was viewed as a terrorist by New Delhi, set off diplomatic tensions between Canada and India.

An American official said the United States had information undermining Russia’s claim that a device it is developing is for peaceful scientific research.

Turkey said it would not resume trade with Israel until a “permanent cease-fire” in Gaza. The move came after a number of countries cut diplomatic ties with Israel.