Other lower level meetings planned for this week underscore the massive task ahead for European allies as they weigh plans for sending a peacekeeping force to Ukraine.

As international leaders discuss security guarantees for Ukraine in a potential peace deal with Russia, Budapest has emerged as a possible venue for direct talks between Presidents Putin and Zelensky.

Russia peace talks in Budapest, a city tied to the broken 1994 security pact, with Trump set to join if the summit happens