There was no international law
Yes there was, just because you're an uneducated neonazi revisionist cretin and dont know history doesnt mean i have to oblige with your stupidity, there were multiple treaties broken by all partitioning countries.
Russia broke the "eternal friendship" treaty, Prussia broke "the good neighbourhood" treaty and Austria broke its 50 years peace treaty so the invasion and occupation of Poland was illegal even in the light of the invading countries own laws so fock you:)))
That's the international consensus, whether you like it or not.
No thats what neonazi twats like you attempt to sell as history and ignore responces that point out actual
history was a bit different then your nazi history 1-0-1 :)))
Also captain troglodity, partition is a process that follows invasion, the end result is annexation and what follows is occupation.
Thats international law for you, XVI century no less, now die of cancer :-)