ANKARA (Reuters) - Turkish President Tayyip Erdogan and German counterpart Frank-Walter Steinmeier discussed the need to improve ties between their countries and take mutual steps to that end during a phone call on Wednesday, Turkish presidential sources said. Aside from bilateral relations, the sources said, Erdogan also briefed Steinmeier about a summit on Syria s conflict held by Turkey, Russia and Iran in the southern Russian city of Sochi on Nov. 22.  