Post-Conflict Ukraine: 4 Possible Security Guarantees

The European allies of the U.S. and Ukraine are brainstorming means of deterring future Russian aggression in the event that a peace deal is reached.

President Donald Trump hosts European leaders at the White House to discuss possible security guarantees for Ukraine on Aug. 18, 2025. Win McNamee/Getty Images

The landmark summit on Aug. 15 between U.S. President Donald Trump and Russian President Vladimir Putin has led to speculation that a deal to end the war in Ukraine could be in the offing.

In the event of a settlement, Kyiv and its allies want assurances—or security guarantees—that would serve to deter any future Russian aggression against post-conflict Ukraine.