 The measure applies 25% tariffs to steel arriving from Mexico that wasn't melted and poured in that country, the U.S. or Canada. Aluminum cast or smelt in China, Russia, Iran or Belarus face a 10% tariff if arrives via Mexico. The move aims to prevent China from circumventing existing levies through so-called transshipment. The measures take effect today. In Hong Kong, I'm Joanne Wong, Bloomberg Radio.