Your morning briefing, the business news you need in just 15 minutes.

On today's podcast:

(1) President Donald Trump delivered on his threat to hit Canada and Mexico with sweeping import levies, imposing one of the largest increases in US tariffs since the 1930s in a dramatic escalation of a trade war that stands to upend ties with major economic partners.

(2) China imposed tariffs as high as 15% on US goods and banned exports to some defense companies in retaliation for the Trump administration’s new levy, escalating a trade war between the world’s two largest economies.

(3) President Donald Trump said the US would impose tariffs on “external” agricultural products starting on April 2, adding another layer of threats to impose trade barriers on imported goods.

(4) Equities fluctuated as President Donald Trump’s tariffs on Canada, Mexico and China went into effect. Oil extended losses.

(5) President Donald Trump ordered a pause to all military aid to Ukraine, turning up the heat on Volodymyr Zelenskiy days after an Oval Office blowup with the Ukrainian president left support from his country’s most important ally in doubt.