By Daphne Psaledakis WASHINGTON (Reuters) – Hundreds of people were detained or went missing in Ukraine’s Kherson region while it was under Russian control this year, and dozens may have been tortured, Yale University researchers have concluded in a report backed by the U.S. State Department. “Russia must halt these operations and withdraw its forces to end a needless war that it cannot and will not win – no matter how despicable and desperate its tactics,” the State Department said in a statement on the report. The report, seen by Reuters ahead of its Friday publication, documents detentions …