no there is nothing illegal about occupation Once a war is won----the defeated remain occupied until they surrender and accept terms ----remember germany? remember Japan?
The problem remains that there was no war---merely a well-organized terrorist campaign to drive out the indigenous people and steal their land...calling this war is an attempt to justify piracy, and a set of lies that would make Goebbells wince in embarrassment
Are you referring to the Land that was taken by Israel after the end of the 1967 war?