lisa: stacie dusetzina of vanderbilt school of medicine, thank you so much. stacie: thank you.isa: in ukraine today, four new merchant ships left black sea ports carrying corn and other food products. they are part of a wartime deal with russia which is temporary lifting its blockade to allow critical worldwide food deliveries. the ships depart from three ports in ukraine, through treacherous black sea waters, and on to destations around the globe, including volatile markets had inflation. as those first ships leave the black sea, another one that was set to arrive in lebanon today but is experiencing delays. ali rogin reports on the complicated choreography and delicate diplomacy of these voyages. ali: bound for lebanon, the ship razoni carried a small fraction of ukraine's stockpile of grains. but the statement she made was giant -- trade from ukraine's black sea ports has, however slowly, resumed. two weeks ago, ukraine and russia struck the deal, russia would lift its blockade of three ports, and allow shipments of grain and other products. ukraine is one of the world's lar