Err, dude, Israel can't annex Israeli territory; that's a contradiction in terms. What it can do is annex territory TO the state of Israel because - du'oh! - that's what "annexation" is. Unfortunately for you, doing that gives the game away i.e. doing that is clearly "conquest", and that has been illegal since at least the end of WW2.
Mob torches refugee center in Prague, hours after anti-Muslim rally (AP)