By Tuvan Gumrukcu and Michelle Nichols ANKARA/NEW YORK (Reuters) – Turkish President Tayyip Erdogan on Wednesday said he wants a general agreement reached between Ukraine, Russia, Turkey and the United Nations on a U.N.-led plan to resume Ukrainian Black Sea grain exports to be put in writing this week. Ankara on Monday said that a meeting between the four parties would “probably” be held this week. The Ukraine war has sent prices soaring for grains, cooking oils, fuel and fertilizer, stoking a global food crisis. “An agreement emerged from the talks in Istanbul last week on the general outlin…