Accompanying Elbegdorj's post were maps of the Mongol Empire of the 13th and 14th centuries. One shows the breadth of the vast but short-lived empire, which at its peak covered 9 million square miles.

He shared maps showing how large the Mongol Empire was, with it once controlling parts of what is now Russia. "After Putin's talk. I found Mongolian historic map. Don't worry. We are a peaceful ...