How rebels in Ukraine built up an arsenal capable of reaching the skies . New : Russian Army says it lost contact with Ukraine . Ukrainian media say Russian forces have expected checkpoint . Russians say convoy contains aid for war - weary civilians . The convoy comes as Ukraine makes gains against pro - Russian rebels .
New : Russian Army says it lost contact with Ukraine . Ukrainian media say Russian forces have expected checkpoint . Russians say convoy contains aid for war - weary civilians . The convoy comes as Ukraine makes gains against pro - Russian rebels .