The first trucks from a Russian aid convoy start crossing back into Russia from Ukraine.<br/> <br />Snaking along the highway, they're at the centre of an international crisis.<br/> <br />Without permission from Kiev around 100 trucks drove through an abandoned border post and into the rebel-controlled east.<br/> <br />Russia said the trucks were carrying desperately-needed supplies of tinned food and water. But the Ukrainian government feared the convoy could be part of a military invasion.<br/> <br />Here they can be seen unloading supplies in Luhansk, which is controlled by pro-Russian separatist fighters.<br/> <br />This city is circled by government troops and has been cut off from power and water.<br/> <br />But for days these trucks were held up by arguments by Kiev and Moscow.<br/> <br />Eventually, Russia said it had run out of patience.<br/> <br />(SOUNDBITE) (English) RUSSIAN AMBASSADOR TO THE UNITED NATIONS, VITALY CHURKIN, SAYING:<br/> <br />"We started moving only when we received official note from the Ukrainian go
