President Volodymyr Zelensky said in Brussels, where the leaders had gathered, that without the money, his country would have to reduce its drone production significantly.

© John Thys/Agence France-Presse — Getty Images

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

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.