I agree that the seacoast and airspace represents a problem, and so is the reliance of Gaza on water and power infrastructure within Israel, which is a difficult humanitarian problem when mutual hostilities exist. I'm pleased to see that you've narrowed your statements to that issue, as it's a huge step in a discussion about the logistics of a solution.
I don't see the text you've cited from your first source when I follow the link about the prerogative of general military operations. There is similar wording in B 3.1 et ff., but limited to defense, and context is needed: Israel is formally at war with Hamas, which (after suspending every election in Gaza after they were put in power) is the de facto regional authority. This is not a claim of a peacetime "right" any more than our in
The second link is not a source, and the most recent attacks at the top of the search are claimed to be a self-defense response.
The link in the third source is nowhere to be found, but it likely rests on UN Resolution 242, of which Hamas (and the PNA insofar as Abbas represents it) has not honored by rejection of affirmation 1(ii): "Termination of all claims or states of belligerency and respect for and acknowledgment of the sovereignty, territorial integrity and political independence of every State in the area and their right to live in peace within secure and recognized boundaries free from threats or acts of force" http://www.un.org/Depts/dpi/palestine/ch3.pdf
