Global tariff markets saw renewed turbulence last week, with exporters urged to watch for emerging cost shifts. On July 20, the U.S. imposed tariffs of up to 50% on select Canadian goods, covering alcohol, cement, dairy products, apparel and other sectors.

Then on July 23, it officially unveiled new Section 301 tariffs targeting 60 countries and regions under a four-tier graduated framework. Additional duties of 10% or 12.5% will apply to certain economies; Mainland China and Hong Kong SAR face the top extra tariff rate of 12.5%.

Meanwhile, U.S. trade restrictions against China keep escalating. The U.S. Department of Commerce issued final anti-dumping and countervailing duty rulings on Chinese L-lysine exports. The maximum anti-dumping rate hits 139.83%, while the peak countervailing duty rate stands at 82.11%.

The U.S. has steadily expanded tariff adjustments recently. A string of measures ranging from sector-specific tariffs to trade probes is reshaping global supply chain layouts.