China should expel tankers that are involved in the trade of oil products to North Korea in defiance of United Nations sanctions, G7 nations and the European Union have urged.

The group of predominantly Western nations said “multiple oil tankers” involved in the trade are using Sansha Bay, in the East China Sea, as a “refuge” during the trades.

“We reiterate our previous request that China inspects the vessels for evidence of illicit oil smuggling, deny them all services and ultimately expel them from your waters as quickly as possible,” according to a letter cited by French news agency AFP signed by the G7, EU,...