President Trump on Monday said the U.S will impose 25% tariffs on goods from South Korea and Japan by Aug. 1, while also threatening to hit a dozen other nations with steep import duties by next month.

The U.S.’s closest security allies in Asia, along with six Southeast Asian countries, have been given another three weeks to negotiate trade deals — or face higher tariffs.

Trump said the United States would impose tariffs of 25% on goods from Tunisia, Malaysia and Kazakhstan, with levies of 30% on South Africa, Bosnia and Herzegovina, climbing to 32% on Indonesia, 35% on Serbia and Bangladesh, 36% on Cambodia and Thailand; and 40% on Laos and Myanmar. A deal with India was close, Trump added.