not sure how long that will last, bau hours later, according to the ukrainian president, ukrainian troops landed an at airfield near luhansk. there were reports of gunfire when pro-russian militants approached near that airfield. when we got there, we saw a crowd of locals amassed talking, shouting sometimes abuse at the ukrainian troops, about what was happening in their otherwise quiet town here in ukraine. one man tried to approach the troops, and we heard warning shots fired. i should stress at this point, despite the increase in the ukrainian military presence here, we are not seeing large reports of casualties, or evidence, or being told by bystanders or witnesses that there have been loss of life or people injured here. at this point we're not seeing clashes. the question is, how does russia react to this. the they have 40,000 troops just across the border.