Ping
One, Russian (Chechnyan) soldiers do their job and go home.
Two, some soldiers desert and fight for Hizbolluh (or false desertion and spying)
Three, Hizbolluh starts taking shots at these guys which would be a weird situation with muslim terrorists shooting at a national military with former members of some extremely vicious guerilla fighters.
In any event the IDF should be pretty pissed at Russia for this.