By Emma Farge GENEVA (Reuters) -The U.N. humanitarian office (OCHA) is moving aid eastwards in Ukraine and plans aid convoys to the rebel regions of Luhansk and Donetsk next week as fighting shifts, a spokesperson told a press briefing on Friday. “We have in our planning convoys to go there I understand already next week. Whether that happens or not depends on the security situation,” Jens Laerke said, calling the regions that Russia has recognised as independent states, “areas of heightened humanitarian concern”. U.N. aid chief Martin Griffiths has visited Ukraine and Russia this week where h…