Canada has started charging extra taxes, called tariffs, on $20 billion worth of goods bought from the United States, with some rates as high as 50%.
Taiwan is using its dominance in advanced computer-chip manufacturing as bargaining power against US and EU demands, while China increases military patrols near Taiwan's Pacific coast.
This week Finland finished a 200-kilometre border fence, Latvia's ban on Russian and Belarusian books and goods took effect, and Germany and Russia expelled diplomats after a drone was found near a plane at a German airport.
German police are investigating an overnight fire at a substation in central Berlin and a cut fence at another substation in the west.
Taiwan makes most of the world's most advanced computer chips, which power artificial intelligence.
American envoys Steve Witkoff and Jared Kushner spent three hours talking with Russian President Vladimir Putin in Moscow, then flew on to Kyiv, Ukraine's capital.
In one week, Germany announced anti-drone units for nine cities after drone incidents including one over Leipzig, Poland asked EU countries to expel up to 40 percent of Russian diplomats, and the German city of Bonn closed a Russian consulate accused of being a spy center.
A month-old, limited conflict between the US and Iran spread this week to Bahrain, Jordan, Iraq, Kuwait and shipping in the Strait of Hormuz, pushing oil above $90 a barrel and rattling bond markets worldwide.
The Wall Street Journal reported that billions of dollars connected to Iran have kept passing through US banks, even though sanctions are meant to keep Iran's money out of the American banking system.
US envoys Steve Witkoff and Jared Kushner spent three hours meeting Vladimir Putin in Moscow, then went to Kyiv for more talks aimed at ending the war.
The US, UK, France and Germany have drafted a plan to send Iran's nuclear program back to the UN Security Council, a move that could bring back international sanctions; no vote date has been set.
Four defense stories broke this week: a U.S.