Turkey and Russia agreed on Wednesday to press for a ceasefire in war-ravaged Libya, but Ankara said the leader of the eastern forces was illegitimate and must withdraw from key positions for a credible truce to take hold. Moscow and Ankara are among the main power brokers in Libya's conflict while supporting opposing sides. Russia backs the eastern-based forces of renegade military commander Khalifa Haftar, while Turkey has helped the Tripoli-based Government of National Accord (GNA) repel Haftar's attempt to storm the capital. "We've just reached an agreement with Russia to work on a credible and sustainable ceasefire in Libya,"...