It is set of very simple rules the nations agreed upon.
Which none of them follow, contrary to the UN charter itself
that includes binding obligations to the Jewish Nation in that territory.
What international law does not oblige for is - establishment of an Arab state.
The sovereignty of each nation is the foundation of international law. Only a sovereign nation is able to agree to an implement international law. When there are terrorists threatening a country, the UN-countries must help.
You claim it is unacceptable when Arab nations create a union. But that is what countries do. I guess it is not not just the others.
Why can´t Israel make peace with neighbors? The others are not much better. Saudi Arabia, ect. But they are secular and no anti-semitism is on their agenda, so this should not be a problem. So now there is Iran in Syria and Lebanon.