As Tensions Rise, Zelensky and Erdogan Discuss Collapsed Grain Deal The Turkish leader has been a key mediator between Russia and Ukraine since the full-scale invasion began last February. Author: Valerie Hopkins Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)MoreClick to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)