President Donald Trump spoke with Russian President Vladimir Putin about ending the war in Ukraine, hosted the president of South Africa at the White House and threatened more stringent tariffs against the European Union this week.

The E.U. has pushed back against President Trump’s latest threat to impose a 50% import tariff on all E.U. goods, warning trade must be built on “respect."

According to JPMorgan, U.S. President Donald Trump is trying to achieve conflicting objectives with his tariff policy by trying to keep the door open for negotiations while also expecting higher revenue and a change to world trading structure.

U.S. President Donald Trump's tariff decisions since he took office on January 20 have shocked financial markets and sent a wave of uncertainty through the global economy.

High-end medical devices, including those made in the United States, may be especially vulnerable to tariffs because they’re built with parts from around the world.

Since taking office, Mr. Trump has raced to enact his economic vision, aiming to pair generous tax cuts with sweeping deregulation that he says will expand America’s economy. He has fashioned his steep, worldwide tariffs as a political cudgel that will raise money, encourage more domestic manufacturing and improve U.S. trade relationships.

On Friday the president threatened a 50% tariff on the European Union and a 25% levy on smart phones if companies failed to move production to the U.S.

Tariff worries reignited on Friday after President Donald Trump threatened the E.U. with 50% tariffs by June 1 and said he would impose a levy aimed at Apple.