... 1.) Palestine was allready a state under mandate, see the international cour rouling regarding the Mavrommatis Concessions. 2.) If anyone was "invading" historic Palestine it was the Zionists emmigrants and not its inhabitants or the parties trying to help them against a hostile takeover, massacres and expulsion. 3.) Since the UN the acqusition of territory by war is inadmissable and not legal, even if you defend yourself or only play the landgrabbing "defender".
Russia vetoes UN resolution on MH17 special tribunal (Reuters)