The Trump administration’s trade war has prompted chaos and countermeasures across the globe, but a potent counterattack has emerged in the courts in recent weeks — and in the long run, it could fatally undermine Trump’s unprecedented global tariff regime.

Three weeks after US President Donald Trump effectively declared a trade war with the whole world, new economic forecasts and surveys will point to the initial fallout.

The effects of President Trump’s new tariffs are starting to be felt across the world, preliminary South Korean trade data suggest, as Seoul prepares to begin negotiations with Washington.