The Hawk missiles modified by Israel have been able to take down a MIG-25 Foxbat from one of the Arab nations during the one of the wars( i think is Yom Kippur/6 Day war) The Foxbat is a high-performance, high-altitude interceptor.
Can our I-Hawks do the same?
http://www.fas.org/nuke/guide/russia/airdef/mig-25.htm