For more than a year the possibility of peace in Ukraine has seemed out of reach. But this week, a new world leader stepped in with an offer to mediate.

After months of waiting, this week Ukraine's President Volodymyr Zelensky spoke with Chinese President Xi Jinping over the phone. Zelensky described the call as "meaningful" and as a potential step toward the elusive goal of peace. China says it plans to help facilitate communication between Russia and Ukraine.

Emma Graham-Harrison is the senior international affairs correspondent for The Guardian and The Observer. She has lived in China and is currently reporting from Ukraine. Today, she takes us through what Xi Jinping is proposing, whether China could bring peace to Ukraine and whether there is reason to be skeptical.