property up the syria regime and make sure the border is secure. israeli f 15 fighter jets maneuvering in the skies, giving the country a technology edge in the region. but now a new presence in the middle east, advanced russian flanker flighter jet in syria, according to the u.s. officials and other russian military arms threatening that edge. satellite pictures inside syria show a rapid buildup with russian military equipment moving in. analysts jonathan spier says these weapons put pressure on israel's aerial control of the region. >> if you have russia aircraft in the sky, if you have russian anti-aircraft systems there, the potential for friction and collision and vulnerability of aircraft becomes much, much greater. >> reporter: in northern israel, we've seen israeli infantry but