It has been a loud news day. Tariffs are flying between old allies, a surprise diplomatic trip has tongues wagging, and scientists are sounding alarms on two very different fronts. Here are the ten stories worth your time.

1. Canada announces ‘dollar for dollar’ retaliatory tariffs on US as high as 50%. The trade war between the US and Canada just got a lot more expensive, with new taxes hitting everything from steel to fresh tuna and makeup.
2. CIA chief travels to Moscow for unannounced talks, US media reports. A surprise trip by America’s top spy to Russia has fueled speculation about quiet diplomacy, even as tensions between the two countries stay high.
3. US removes Syria from list of state sponsors of terrorism. Washington is formally embracing Syria’s new government, led by a former militant with al Qaeda ties, marking a striking reversal of decades of US policy.
4. Treasury Secretary Scott Bessent unveils new US economic sanctions to isolate Iran. The administration is calling this an economic D Day on Iran, and Tehran is promising to hit back just as hard.
5. US set for largest mass visa revocation in history, targeting up to 200,000 foreigners. Officials are preparing to pull visas from tens of thousands of people who sought asylum, a move that would upend lives well beyond Washington.
6. Supreme Court gives Trump an interim win on his mail voting order, but hurdles loom. The court paused a lower ruling that had blocked limits on mail voting ahead of the midterms, though the fight over how Americans cast ballots is far from settled.
7. The UK will help Ukraine make long range missiles by sharing classified tech information. Britain is handing over details on UK made missile parts so Ukraine can start assembling long range weapons on its own, a real step up in military support.
8. Brain disease in dead NFL players ‘higher than previously shown’. A new study found at least one in four former NFL players who died in recent years had a degenerative brain disease, and researchers think the real number could be even higher.
9. World’s oceans hit highest temperature on record as El Nino grows. Scientists are calling the record another clear sign of an ocean under mounting stress, with El Nino adding fuel to an already warming planet.
10. Shein aims for almost $27bn valuation in stock market debut. The fast fashion giant is set to start trading in Hong Kong on September 1, a defining moment after years of scrutiny over its labor and environmental practices.