Rain and flooding from Typhoon Narra hits China and Vietnam
The cancellation follows Trump's surprise order last week to scale back a separate annual joint military drill.
War-induced shortages set off cross-border fuel runs and deepen energy problems for Russia's allies.
Exerting maximum economic pressure on Tehran would risk blowback from Beijing.
Using the carcinogen to preserve food is prohibited in China, the world's largest producer of cabbages.