By Yesim Dikmen and Ali Kucukgocmen KYIV (Reuters) – Ukraine said on Wednesday that an agreement to resume grain exports blocked by Russia appeared close as Turkey hosted four-way talks, raising hopes of an end to a standoff that has exposed millions to the risk of starvation. Kyiv believed a deal was just “two steps away”, Foreign Minister Dmytro Kuleba was quoted as saying before the talks began, though other participants seemed less optimistic, and Turkey’s defence ministry gave no details of the meeting’s outcome after announcing it had ended. A United Nations spokesman said U.N. chief Ant…