...The Israelis aren't anticipating having to fight...the U.S. or Russia or China?
Duh.
F-15s are pretty awesome (my personal favorite fighter jet) and more than capable of taking on most of the dumbfuck-primitive world the U.S. (and Israel) and its close allies are likely to come up against in a war situation. ie. Any mother middle-eastern nation not Israel or Saudi Arabia or Jordan (who back Israel over Iran anyway). You know, the *actual* civilized & respectable middle-eastern countries.
Thing is, it's 40 year old tech and not the tip-of-the-spear stuff America or the U.S. are going to be fielding against Russia or China should those backwards cavemen decide to step out of line. Simple stuff - what you've seen from the U.S. & U.K is what they've allowed you to see whilst curbstomping dumbfuck terrorist nothings over a couple of decades. What they're *actually* fielding in any peer-to-peer all-out-war situation is going to have you and your haji friend shitting your britches left right and center. Such is civilization, reap the whirlwind, fuckers.