Since WW2, an international legal system has evolved. It is still weak in many areas and far from comprehensive. However, it is shameful that the US has spent so many years deliberately undermining international legal progress in order to protect Israel. You are quite right. The US/Quartet/Israeli 'peace process' is not just a sham but also a clear attempt to subvert international laws and treaties, e.g. GC4.
from the article: No realistic chance of permanent Middle East peace