ISTANBUL, July 21 (Reuters) - Russia, Ukraine and Turkey will gather on Friday to sign a deal proposed by the United Nations to free up grain exports from Ukraine's besieged Black Sea ports, Turkish President Tayyip Erdogan's office said on Thursday.
U.N. Secretary-General Antonio Guterres, who earlier announced that he was heading to Istanbul on Thursday, will attend the event along with Erdogan at the Dolmabahce Palace offices at 1330 GMT, the statement said.
