关税突发！特朗普再威胁征税，宣布国家紧急状态

Group 1 - The core viewpoint of the article highlights President Trump's threats to impose tariffs on goods from countries supplying oil to Cuba and on Canadian aircraft due to certification disputes [1][4] - Trump signed an executive order declaring a national emergency regarding the tariffs on goods from countries providing oil to Cuba [1] - The U.S. will suspend the certification of Bombardier's Global Express series and all Canadian-made aircraft until the Gulfstream aircraft receive full certification [1] Group 2 - Trump warned that if the certification issues are not resolved immediately, a 50% tariff will be imposed on all Canadian aircraft exported to the U.S. [1] - International gold and silver prices rose during the Asian trading session, following a day when they reached historical highs [1][2] - The London gold price was reported at 5435.895, reflecting a 1.09% increase, while the London silver price was at 117.585, up by 1.48% [2]