NATO chief Jens Stoltenberg and Ukraine President Volodymyr Zelensky took center stage at Thursday’s European Union summit, underscoring the importance the 27 EU leaders attach to protecting their eastern flank from Russian aggression and beefing up Ukraine’s defense capabilities.

Zelensky was to address the gathering by video link and Stoltenberg to host an early lunch for the leaders. But the biggest seat at the table will be reserved for something that’s not officially on the agenda: the fallout from the stunning weekend mutiny in Russia.