Good summary. You could also add Minsk 2 Agreement proposed by France & Germany and agreed to by Russia & the Ukraine in 2015.
If we support the Ukraine's right to silo Nato missiles & weapons of war directed at Russia, then this would weaken our right to object to Chinese missiles or weapons of war directed at Aus in PNG or Indonesia in say a few years time.
As the saying goes: "Be careful what you wish for"