Russia hits Ukraine's steel heart; the US-China summit ends with pandas and no deals; and the EU presses Britain on Chinese cars

A supply shock is a sudden fall in how much of a good can be produced, and this strike is a clean example of one hitting an industrial commodity. Ukraine's biggest steelmaker goes offline, so the amount of steel available to European buyers falls immediately. When supply falls and demand stays the same, the price rises. That is the basic market mechanism, and it works the same way whether the cause is a flood, a strike or a missile.

What makes this harder to absorb than a typical supply disruption is that European steel markets were already tight. Buyers cannot simply call up an alternative supplier the next morning: steel is heavy, contracts are long, and capacity elsewhere in Europe is running near its limits. The longer the plant stays shut, the more the price signal spreads into the goods that use steel, from apartment blocks to wind turbines. One strike does not reshape a continent's cost base, but a sustained campaign against Ukrainian industry could, and that is the question this story leaves open.

Xi's line about avoiding the "Thucydides Trap" is a reference to the idea, drawn from ancient Greek history, that a rising power and an established one tend to end up in war almost by accident, through fear and miscalculation rather than deliberate choice. The political science version of this argument says the structural pressure toward conflict is so strong that leaders need to work actively against it. Xi is signalling that he thinks deliberate management can override the structural pull. That is an optimistic reading, and I'd argue the summit's empty outcome makes it harder to sustain.

The trade dimension is where the gap between rhetoric and reality is sharpest. The tariffs that both sides imposed during the 2018 to 2025 cycle are still in place. A tariff is a tax on imports, paid by the importing country's businesses and ultimately passed on to consumers. As long as those taxes stay high, the cost of moving goods across the Pacific stays high, and firms keep building alternative supply chains through Vietnam, Mexico and India. One state dinner does not reverse five years of supply-chain rewiring. The question worth sitting with is whether Xi's optimism reflects a genuine shift in Beijing's calculation, or whether it is a public-relations move ahead of a difficult domestic economic period.

A tariff is a tax that a government charges on goods coming in from another country. The EU has set high tariffs on Chinese electric vehicles because it believes Chinese carmakers receive state subsidies that let them sell cars below the true cost of production, undercutting European rivals. The UK, which left the EU's customs union in 2020, sets its own tariff rates and has kept them lower. That gap is the problem Brussels is pointing at.

The mechanism the EU fears works like this. A Chinese carmaker ships cars to the UK, pays the lower UK tariff, and then sells them into the EU market claiming they were sold in Europe. If EU rules allow goods that have been through a third country to enter at a lower rate, the higher EU tariff is effectively bypassed. The UK faces a genuine dilemma: raising tariffs to match the EU would protect the EU relationship but anger Chinese partners and raise prices for British car buyers; keeping them low risks a trade dispute with its largest neighbour. This is a good example of how leaving a customs union does not free a country from its neighbours' trade politics, it just changes the form the pressure takes.