European leaders are discussing a security guarantee for Ukraine that would commit Kyiv¡¯s allies to decide within 24 hours whether to provide military support to the country if it¡¯s again attacked by Russia.

A proposal that amounts to a NATO-like collective defense clause, but doesn¡¯t come with actual membership in the alliance, is being pushed by Italian Prime Minister Giorgia Meloni. It¡¯s among an array of options being fleshed out as European leaders leverage momentum after U.S. President Donald Trump agreed to back security guarantees for the war-battered nation.

The Italian plan recognizes that NATO membership for Ukraine is off the table, but would offer a mechanism for collective assistance as the next best option, according to people familiar with the deliberations.