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.

According to Politico, the White House has proposed a new location for a potential meeting between Ukrainian President Volodymyr Zelenskyy and Russian leader Vladimir Putin - Budapest. It is said that the US Secret Service is preparing for a summit in Hungary.

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.