The Palestinians declared independence on their own land, inside their own international borders. That the territory was crawling with foreign troops does not matter. Those troops had no sovereignty.The APG had it had no administration, no civil service, no money, and had no sovereign territory of its own to defend.
ARTICLE 3
The political existence of the state is independent of recognition by the other states. Even before recognition the state has the right to defend its integrity and independence,...ARTICLE 4States are juridically equal, enjoy the same rights, and have equal capacity in their exercise. The rights of each one do not depend upon the power which it possesses to assure its exercise, but upon the simple fact of its existence as a person under international law.
The idea that you can negate a peoples' rights by military force is unfounded in international law.
There never were palestinians. When Egypt seized Gaza in the ‘48 War and Jordan seized Judea and Samaria, calling them west bank, not “palestine,” neither country created a palestinian state—No such people existed.