Int'l law does not distinguish between "defensive" and "aggressive" wars when it comes to the "acquisition of territory by war", precisely because it is oh-so-easy for the aggressor to shout "But! But! They had it comin' to them!". After all, there is no question that Israel started the Six Day War, and that remains true no matter how many times the hasbarah hacks shout out that: But! But! Nasser Had It Comin' To Him!
Donald Trump: Israeli settlement construction in West Bank should 'keep going' (Haaretz)
from the article: Israel can't put occupation up for immoral referendum