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US President Donald Trump answers a reporter's question during an interview with Reuters in the Oval Office of the White House in Washington, US August 20, 2018.[Photo/Agencies]

US tech giant IBM is beefing up efforts to promote free artificial intelligence and STEM-related courses at Chinese schools, aiming to prepare more students for future technology breakthroughs.

US President Donald Trump said recently Washington was sending an "armada" to the Korean Peninsula to check attempts by the DPRK to conduct more nuclear and missile tests.

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US President Donald Trump talks to business owners on Tuesday as he tours Kenosha, Wisconsin. The city has seen demonstrations after a police officer shot black man Jacob Blake. EVAN VUCCI/ASSOCIATED PRESS

US President Donald Trump speaks with reporters before departure from Elko Regional Airport in Elko, Nevada, US, Oct 20, 2018. [Photo/Agencies]

US Homeland Security Secretary Kirstjen Nielsen said in an interview with the Fox News Channel that her department had asked the Pentagon for help to bolster its capabilities, including for "some air support ... some logistics, planning, vehicle barriers, engineering."

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US President Donald Trump makes remarks in the Rose Garden of the White House in Washington, DC on expanding health coverage options for small businesses and workers on June 14, 2019. [Photo/IC]

US President Donald Trump addresses the coronavirus task force daily briefing at the White House in Washington, US, March 26, 2020. REUTERS/Jonathan Ernst

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US President Donald Trump has fiercely criticized the deal. If he refuses to waive sanctions against Teheran by a May 12 deadline, the accord may unravel.

US policymakers must face the facts, said Michael Fuchs, an expert on US foreign policy.