up security. yards from yemen, houthi rebels just across the border. that s the border yemeni border. it belongs saudi border guards show us preparations for a war they hope won t happen. guards to be told to be ready for anything. we will remind them it s our country and we have to defend our country with our lives. they are happy to defend themselves with their lives. reporter: just over there, that s the yemeni border post. i m riding along here with the border guards just a few months ago we didn t have to wear the flack jackets and helmets. they said now the situation has changed. army tanks have been brought in to back them up. it s one of the units belong to the army, one tank. it s supporting us in case of any movement on the other side. reporter: it s very close. we re half a mile to the border.