Europe has some of the world’s most ambitious climate goals, but in recent months it has backtracked on rules governing automobile emissions and deforestation.

The continent’s leaders are discussing a contentious deal to back Ukraine and its war effort. The final decision will signal the extent of Europe’s ability to face down Moscow.

© Laetitia Vancon for The New York Times

The latest proposal is designed to deter future Russian aggression. But Russia is not part of the talks and has shown little willingness to negotiate.

© Laetitia Vancon for The New York Times

Readers mourn Rob Reiner and take offense at the president’s crude response. Also: America snubs its allies; phone scams; former President Joe Biden’s library.

Two days of talks between President Volodymyr Zelensky and allies have brought some progress on security guarantees, but Russia remains opposed to any foreign forces in Ukraine.

© Tyler Hicks/The New York Times

Demotion need not be traumatic.

Demotion need not be traumatic.

Preventing a world where dictators can attack at will requires a military that has the right tools, the right tactics and the right culture.

Preventing a world where dictators can attack at will requires a military that has the right tools, the right tactics and the right culture.

For the sake of global security and freedom, the world’s democracies must collaborate better.

For the sake of global security and freedom, the world’s democracies must collaborate better.

The U.S. seizure of a vessel off Venezuela is likely to squeeze the country’s government, but do little to counter the tankers that secretively move oil from sanctioned countries.

Governments are studying the decision to prohibit youths from using platforms like Facebook and TikTok as worries grow about the potential harm they cause.

Crumbling highways. A housing shortage. Broken infrastructure. America is stuck. But the pendulum may be ready to swing.

It’s an actual place, not an arbitrarily bounded zone.

The former chief executive of Nexperia, a Dutch chipmaker, said Dutch officials had known for years that the company’s Chinese owner sought to move its technology to China.

Provided Europeans want to fight for it.

Threats against us aren’t limited to one hemisphere.

President Trump is shifting from discussion of the long-lasting competition among the world’s biggest economies and nuclear powers.

A diplomatic row with Japan over Taiwan has China turning to Britain and France for support, appealing to their shared history as wartime allies.

From Sweden to Brazil, six small companies talk about how they are communicating with their U.S. customers amid uncertainty over Trump’s changing tariffs.

The contracts are the latest sign of how Europe is lagging the United States in the race to break China’s chokehold on rare earths.

At an international conference, researchers at the forefront of animal-human transplantation compared notes and allowed themselves the first real optimism in decades.

Drones, missiles and other crucial components of Europe’s rush to rearm itself rely on an increasingly unsteady supply of minerals from China.

President Trump has used his sweeping global tariffs as an economic tool and a political cudgel. A decision invalidating them could hamper his power.