Turkey's President Recep Tayyip Erdogan sat dowb with Russian counterpart Vladimir Putin Tuesday for a diplomatic reset — just as relations with the United States and Europe show strains after last month's failed coup. The summit was aimed at ending a period of high tension and trade sanctions after Turkey downed a Russian fighter jet near the Syrian border last November — an act described by Putin as a "stab in the back." Turkey's relations with traditional allies including the U.S. have faltered over Ankara's post-coup crackdown, which has seen nearly 18,000 people detained or arrested and tens of thousands...