The European Council convenes on Thursday, and at stake is a contentious deal to back Ukraine and its war effort. The final decision is a major test of Europe’s ability to support Ukraine.

© 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

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