News of Sunday 27 May 2018

• Liverpool goalkeeper Loris Karius sent death threats after Champions League blunders
• Four Russian servicemen killed in militant shelling in eastern Syria
• Turkey would purchase Russian Su-57 warplanes if US bars sale of F-35 jets: Report
• Iran warns will stop negotiations if Europe wastes time
• Trump's new strategies will further isolate US: Iranian FM
• Yazd is improving tourism standards, restoration and renovation projects